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Toplam 27104 kayıt

Synthesis and Determination of Acid Dissociation Constants of Some New 4 5 Dihydro 1H 1 2 4 Triazol 5 one Derivatives

Haydar, Y., Şule, B., Zafer, O., M, Ö., M, O., B, E., T, M. (2005) "Synthesis and Determination of Acid Dissociation Constants of Some New 4 5 Dihydro 1H 1 2 4 Triazol 5 one Derivatives", Asian Journal of Chemistry, 17 (1) pp. 195-201 [SCI Expanded]   Haydar, Y., Şule, B., Zafer, O., M, Ö., M, O., B, E., T, M. (2005) "Synthesis and Determination of Acid Dissociation Constants of Some New 4 5 Dihydro 1H 1 2 4 Triazol 5 one Derivatives", Asian Journal of Chemistry, 17 (1) pp. 195-201 [SCI Expanded]  
2005 Özgün Makale SCI/SSCI/AHCI ESCI Scopus
Asian Journal of Chemistry

Synthesis and antioxidant activities of new 1-acetyl-3-alkyl(aryl)-4-[3-ethoxy-2-(p-methoxybenzoxy)-benzylidenamino]-4,5-dihydro-1H-1,2,4-triazol-5-on

Kardaş, F., BEYTUR, M., YÜKSEK, H., GÜRSOY-KOL, Ö. (2017) "Synthesis and antioxidant activities of new 1-acetyl-3-alkyl(aryl)-4-[3-ethoxy-2-(p-methoxybenzoxy)-benzylidenamino]-4,5-dihydro-1H-1,2,4-triazol-5-on", Sixth Bozok Science Workshop 2017 , (pp. 106), Yozgat, Türkiye, (Ağustos 2017 Kardaş, F., BEYTUR, M., YÜKSEK, H., GÜRSOY-KOL, Ö. (2017) "Synthesis and antioxidant activities of new 1-acetyl-3-alkyl(aryl)-4-[3-ethoxy-2-(p-methoxybenzoxy)-benzylidenamino]-4,5-dihydro-1H-1,2,4-triazol-5-on", Sixth Bozok Science Workshop 2017 , (pp. 106), Yozgat, Türkiye, (Ağustos 2017
2017 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
Sixth Bozok Science Workshop 2017

Evaluation of Experimental and Theoretical Properties of 3-n-Propyl-4-[4-(3-methoxybenzoxy)-4-ethoxybenzylidenamino]-4,5-dihydro-1H-1,2,4-triazol-5-one Molecule

BEYTUR, M., İrak, Z.Ş.T., YÜKSEK, H. (2019) "Evaluation of Experimental and Theoretical Properties of 3-n-Propyl-4-[4-(3-methoxybenzoxy)-4-ethoxybenzylidenamino]-4,5-dihydro-1H-1,2,4-triazol-5-one Molecule", 5th International Congress on Vocational and Technical Sciences (UMTEB-V) , (pp. 238-253), Kahire, Mısır, (Şubat 2019 BEYTUR, M., İrak, Z.Ş.T., YÜKSEK, H. (2019) "Evaluation of Experimental and Theoretical Properties of 3-n-Propyl-4-[4-(3-methoxybenzoxy)-4-ethoxybenzylidenamino]-4,5-dihydro-1H-1,2,4-triazol-5-one Molecule", 5th International Congress on Vocational and Technical Sciences (UMTEB-V) , (pp. 238-253), Kahire, Mısır, (Şubat 2019
2019 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
5th International Congress on Vocational and Technical Sciences (UMTEB-V)

Synthesis of New 2-Methoxy-6-[(1-acetyl-3-alkyl/aryl)-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl)imino-methyl]phenyl 3-Nitrobenzoates

MANAP, S., YÜKSEK, H. (2022) "Synthesis of New 2-Methoxy-6-[(1-acetyl-3-alkyl/aryl)-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl)imino-methyl]phenyl 3-Nitrobenzoates", LATIN AMERICA 4th INTERNATIONAL CONFERENCE ON SCIENTIFIC RESEARCHES , (pp. 546-551), Mexıco Cıty, Meksika, (Kasım 2022 MANAP, S., YÜKSEK, H. (2022) "Synthesis of New 2-Methoxy-6-[(1-acetyl-3-alkyl/aryl)-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl)imino-methyl]phenyl 3-Nitrobenzoates", LATIN AMERICA 4th INTERNATIONAL CONFERENCE ON SCIENTIFIC RESEARCHES , (pp. 546-551), Mexıco Cıty, Meksika, (Kasım 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
LATIN AMERICA 4th INTERNATIONAL CONFERENCE ON SCIENTIFIC RESEARCHES

Theoretical (B3lyp) and Spectroscopic (Ft-Ir, 1h-Nmr and 13c-Nmr) Investigation of 2- Methoxy-6-[(3-(P- Methylbenzyl)-4,5-Dihydro-1h-1,2,4-Triazol-5-One-4-Yl)-Azomethin]-Phenyl Benzoate

KOTAN, G., YÜKSEK, H. (2022) "Theoretical (B3lyp) and Spectroscopic (Ft-Ir, 1h-Nmr and 13c-Nmr) Investigation of 2- Methoxy-6-[(3-(P- Methylbenzyl)-4,5-Dihydro-1h-1,2,4-Triazol-5-One-4-Yl)-Azomethin]-Phenyl Benzoate", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 120-128), Antalya, Türkiye, (Aralık 2022 KOTAN, G., YÜKSEK, H. (2022) "Theoretical (B3lyp) and Spectroscopic (Ft-Ir, 1h-Nmr and 13c-Nmr) Investigation of 2- Methoxy-6-[(3-(P- Methylbenzyl)-4,5-Dihydro-1h-1,2,4-Triazol-5-One-4-Yl)-Azomethin]-Phenyl Benzoate", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 120-128), Antalya, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
International Conference on Basic Sciences and Technology (ICBAST)

Experimentical and Gaussian Calculations of 3-Ethyl-4-(2-benzenesulfonyloxy)-benzylideneamino-4,5- dihydro-1H-1,2,4-triazol-5-one

AYTEMİZ, F., BEYTUR, M., YÜKSEK, H. (2022) "Experimentical and Gaussian Calculations of 3-Ethyl-4-(2-benzenesulfonyloxy)-benzylideneamino-4,5- dihydro-1H-1,2,4-triazol-5-one", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 103-111), Antalya, Türkiye, (Aralık 2022 AYTEMİZ, F., BEYTUR, M., YÜKSEK, H. (2022) "Experimentical and Gaussian Calculations of 3-Ethyl-4-(2-benzenesulfonyloxy)-benzylideneamino-4,5- dihydro-1H-1,2,4-triazol-5-one", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 103-111), Antalya, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
International Conference on Basic Sciences and Technology (ICBAST)

2-(3-Methyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl-azomethine)-Phenyl Cinnamate: Theoretical and Experimentical Properties

AYTEMİZ, F., BEYTUR, M., YÜKSEK, H. (2022) "2-(3-Methyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl-azomethine)-Phenyl Cinnamate: Theoretical and Experimentical Properties", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 66-76), Antalya, Türkiye, (Aralık 2022 AYTEMİZ, F., BEYTUR, M., YÜKSEK, H. (2022) "2-(3-Methyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl-azomethine)-Phenyl Cinnamate: Theoretical and Experimentical Properties", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 66-76), Antalya, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
International Conference on Basic Sciences and Technology (ICBAST)

Experimental (FT-IR, 13C/ 1H-NMR) and DFT Studies of 3-(p-Methylbenzyl)-4-(4-methylthiobenzylidenamino-4,5- dihydro-1H-1,2,4-triazol-5-one

KOTAN, G., BEYTUR, M., YÜKSEK, H. (2022) "Experimental (FT-IR, 13C/ 1H-NMR) and DFT Studies of 3-(p-Methylbenzyl)-4-(4-methylthiobenzylidenamino-4,5- dihydro-1H-1,2,4-triazol-5-one", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 49-57), Antalya, Türkiye, (Aralık 2022 KOTAN, G., BEYTUR, M., YÜKSEK, H. (2022) "Experimental (FT-IR, 13C/ 1H-NMR) and DFT Studies of 3-(p-Methylbenzyl)-4-(4-methylthiobenzylidenamino-4,5- dihydro-1H-1,2,4-triazol-5-one", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 49-57), Antalya, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
International Conference on Basic Sciences and Technology (ICBAST)

Density Functional Theory and Ab Initio Hartree-Fock Computational Study of 2-[1-Acetyl-3-methyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl]-Phenoxyacetic Acide

BEYTUR, M., YÜKSEK, H. (2022) "Density Functional Theory and Ab Initio Hartree-Fock Computational Study of 2-[1-Acetyl-3-methyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl]-Phenoxyacetic Acide", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 30-42), Antalya, Türkiye, (Aralık 2022 BEYTUR, M., YÜKSEK, H. (2022) "Density Functional Theory and Ab Initio Hartree-Fock Computational Study of 2-[1-Acetyl-3-methyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl]-Phenoxyacetic Acide", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 30-42), Antalya, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
International Conference on Basic Sciences and Technology (ICBAST)

Quantum Chemical Calculations of 3-Benzyl-4-(3-ethoxy-2-(4-toluenesulfonlyoxy)-benzlyidene amino]-4,5-dihydro-1H-1,2,4-triazol-5-one

BOY, S., KOTAN, G., BEYTUR, M., YÜKSEK, H. (2022) "Quantum Chemical Calculations of 3-Benzyl-4-(3-ethoxy-2-(4-toluenesulfonlyoxy)-benzlyidene amino]-4,5-dihydro-1H-1,2,4-triazol-5-one", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 10-21), Antalya, Türkiye, (Aralık 2022 BOY, S., KOTAN, G., BEYTUR, M., YÜKSEK, H. (2022) "Quantum Chemical Calculations of 3-Benzyl-4-(3-ethoxy-2-(4-toluenesulfonlyoxy)-benzlyidene amino]-4,5-dihydro-1H-1,2,4-triazol-5-one", International Conference on Basic Sciences and Technology (ICBAST) , (pp. 10-21), Antalya, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
International Conference on Basic Sciences and Technology (ICBAST)

Quantum Computational and Spectroscopik Analysis of 2-(3-Methyl-4,5-dihydro-1H-1,2,4-triazol-5-on-4-yl-azomethine)phenyl benzenesulfonate

MANAP, S., KOTAN, G., YÜKSEK, H. (2022) "Quantum Computational and Spectroscopik Analysis of 2-(3-Methyl-4,5-dihydro-1H-1,2,4-triazol-5-on-4-yl-azomethine)phenyl benzenesulfonate", Latin America 4th Internatİonal Conference on Scientific Researches , (pp. 537-545), Mexıco Cıty, Meksika, (Kasım 2022 MANAP, S., KOTAN, G., YÜKSEK, H. (2022) "Quantum Computational and Spectroscopik Analysis of 2-(3-Methyl-4,5-dihydro-1H-1,2,4-triazol-5-on-4-yl-azomethine)phenyl benzenesulfonate", Latin America 4th Internatİonal Conference on Scientific Researches , (pp. 537-545), Mexıco Cıty, Meksika, (Kasım 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
Latin America 4th Internatİonal Conference on Scientific Researches

2-[(1-Acetyl-3-ethyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl)-azomethine]-phenyl furan-2-carboxylate: Electronic and Spectroscopic Properties with Density Functional Theory

ALBAYRAK, Ö., BEYTUR, M., YÜKSEK, H. (2022) "2-[(1-Acetyl-3-ethyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl)-azomethine]-phenyl furan-2-carboxylate: Electronic and Spectroscopic Properties with Density Functional Theory", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 1054-1059), Ankara, Türkiye, (Aralık 2022 ALBAYRAK, Ö., BEYTUR, M., YÜKSEK, H. (2022) "2-[(1-Acetyl-3-ethyl-4,5-dihydro-1H-1,2,4-triazol-5-one-4-yl)-azomethine]-phenyl furan-2-carboxylate: Electronic and Spectroscopic Properties with Density Functional Theory", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 1054-1059), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
4th International Eurasian Conference on Science, Engineering and Technology

Experimental (13C/ 1H-NMR, FT-IR) and DFT Study of 3-Ethyl-4-(3-carboxyphthalimido)-4,5-dihydro-1H-1,2,4-triazol-5-one

BOY, S., KOTAN, G., YÜKSEK, H. (2022) "Experimental (13C/ 1H-NMR, FT-IR) and DFT Study of 3-Ethyl-4-(3-carboxyphthalimido)-4,5-dihydro-1H-1,2,4-triazol-5-one", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 890-897), Ankara, Türkiye, (Aralık 2022 BOY, S., KOTAN, G., YÜKSEK, H. (2022) "Experimental (13C/ 1H-NMR, FT-IR) and DFT Study of 3-Ethyl-4-(3-carboxyphthalimido)-4,5-dihydro-1H-1,2,4-triazol-5-one", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 890-897), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
4th International Eurasian Conference on Science, Engineering and Technology

Spectroscopic, Thermodynamic, Electronic, HOMO-LUMO, MEP and NLO Analyses of 3-(Benzyl)-4-(3-Acetoxy-4-methoxybenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one

BOY, S., KOTAN, G., YÜKSEK, H. (2022) "Spectroscopic, Thermodynamic, Electronic, HOMO-LUMO, MEP and NLO Analyses of 3-(Benzyl)-4-(3-Acetoxy-4-methoxybenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 865-874), Ankara, Türkiye, (Aralık 2022 BOY, S., KOTAN, G., YÜKSEK, H. (2022) "Spectroscopic, Thermodynamic, Electronic, HOMO-LUMO, MEP and NLO Analyses of 3-(Benzyl)-4-(3-Acetoxy-4-methoxybenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 865-874), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
4th International Eurasian Conference on Science, Engineering and Technology

Structural, spectroscopic, electronic, thermodynamic and Non-Linear Optic Analysis of 3-(n-propyl)-4-(3,4-dimethoxybenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one

Özdemir, G., YÜKSEK, H. (2022) "Structural, spectroscopic, electronic, thermodynamic and Non-Linear Optic Analysis of 3-(n-propyl)-4-(3,4-dimethoxybenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 656-664), Ankara, Türkiye, (Aralık 2022 Özdemir, G., YÜKSEK, H. (2022) "Structural, spectroscopic, electronic, thermodynamic and Non-Linear Optic Analysis of 3-(n-propyl)-4-(3,4-dimethoxybenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 656-664), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
4th International Eurasian Conference on Science, Engineering and Technology

Synthesis and characterization of some novel potential biologically active 1-(2,6-dimethylmorpholine-4-ylmethyl)-3-alkyl(aryl)-4-(3,4-dimethoxybenzylidenamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones

Özdemir, G., YÜKSEK, H. (2022) "Synthesis and characterization of some novel potential biologically active 1-(2,6-dimethylmorpholine-4-ylmethyl)-3-alkyl(aryl)-4-(3,4-dimethoxybenzylidenamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 651-655), Ankara, Türkiye, (Aralık 2022 Özdemir, G., YÜKSEK, H. (2022) "Synthesis and characterization of some novel potential biologically active 1-(2,6-dimethylmorpholine-4-ylmethyl)-3-alkyl(aryl)-4-(3,4-dimethoxybenzylidenamino)-4,5-dihydro-1H-1,2,4-triazol-5-ones", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 651-655), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
4th International Eurasian Conference on Science, Engineering and Technology

3-Metil-4-(3-metoksi-4-(p-nitrobenzoksi)-benzilidenamino)-4,5-dihidro-1H-1,2,4-triazol-5-on molekülünün deneysel ve teorik spektroskopik özellikleri

MANAP, S., YÜKSEK, H., BEYTUR, M. (2022) "3-Metil-4-(3-metoksi-4-(p-nitrobenzoksi)-benzilidenamino)-4,5-dihidro-1H-1,2,4-triazol-5-on molekülünün deneysel ve teorik spektroskopik özellikleri", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 469-476), Ankara, Türkiye, (Aralık 2022 MANAP, S., YÜKSEK, H., BEYTUR, M. (2022) "3-Metil-4-(3-metoksi-4-(p-nitrobenzoksi)-benzilidenamino)-4,5-dihidro-1H-1,2,4-triazol-5-on molekülünün deneysel ve teorik spektroskopik özellikleri", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 469-476), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
4th International Eurasian Conference on Science, Engineering and Technology

Heterosiklik 2-Metoksi-4-[(3-metil-4,5-dihidro-1H-1,2,4-triazol-5-on-4-il)-azometin]-fenil furan-2-karboksilat bileşiğinin spektroskopik ve doğrusal olmayan optik özellikleri

MANAP, S., YÜKSEK, H., BEYTUR, M. (2022) "Heterosiklik 2-Metoksi-4-[(3-metil-4,5-dihidro-1H-1,2,4-triazol-5-on-4-il)-azometin]-fenil furan-2-karboksilat bileşiğinin spektroskopik ve doğrusal olmayan optik özellikleri", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 477-482), Ankara, Türkiye, (Aralık 2022 MANAP, S., YÜKSEK, H., BEYTUR, M. (2022) "Heterosiklik 2-Metoksi-4-[(3-metil-4,5-dihidro-1H-1,2,4-triazol-5-on-4-il)-azometin]-fenil furan-2-karboksilat bileşiğinin spektroskopik ve doğrusal olmayan optik özellikleri", 4th International Eurasian Conference on Science, Engineering and Technology , (pp. 477-482), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
4th International Eurasian Conference on Science, Engineering and Technology

Synthesis and characterization of new some 1-acetyl-3-alkyl(aryl)-4-(2-benzenesulfonyloxy-3-methoxy)-benzylideneamino-4,5-dihydro-1H-1,2,4-triazol-5-ones

MANAP, S., YÜKSEK, H. (2022) "Synthesis and characterization of new some 1-acetyl-3-alkyl(aryl)-4-(2-benzenesulfonyloxy-3-methoxy)-benzylideneamino-4,5-dihydro-1H-1,2,4-triazol-5-ones", 5th Internatiıonal Eurasian Conference on Biological and Chemical Sciences , (pp. 998-1001), Ankara, Türkiye, (Aralık 2022 MANAP, S., YÜKSEK, H. (2022) "Synthesis and characterization of new some 1-acetyl-3-alkyl(aryl)-4-(2-benzenesulfonyloxy-3-methoxy)-benzylideneamino-4,5-dihydro-1H-1,2,4-triazol-5-ones", 5th Internatiıonal Eurasian Conference on Biological and Chemical Sciences , (pp. 998-1001), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
5th Internatiıonal Eurasian Conference on Biological and Chemical Sciences

Molecular, Electronic and Thermodynamic Properties of 3-Ethyl-4-(p-methylthiobenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one with Density Functional Theory

Yılmaz, Y., BEYTUR, M., YÜKSEK, H. (2022) "Molecular, Electronic and Thermodynamic Properties of 3-Ethyl-4-(p-methylthiobenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one with Density Functional Theory", 5th Internatiıonal Eurasian Conference on Biological and Chemical Sciences , (pp. 936-943), Ankara, Türkiye, (Aralık 2022 Yılmaz, Y., BEYTUR, M., YÜKSEK, H. (2022) "Molecular, Electronic and Thermodynamic Properties of 3-Ethyl-4-(p-methylthiobenzylideneamino)-4,5-dihydro-1H-1,2,4-triazol-5-one with Density Functional Theory", 5th Internatiıonal Eurasian Conference on Biological and Chemical Sciences , (pp. 936-943), Ankara, Türkiye, (Aralık 2022
2022 Tebliğ/Bildiri SCI/SSCI/AHCI ESCI Scopus
5th Internatiıonal Eurasian Conference on Biological and Chemical Sciences