Browsing by Author "Yıldız, Yaşar Kemal"
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Diterpenes from Sideritis argyrea
Topçu, Gülaçtı; Gören, Ahmet C.; Kılıç, Turgut; Yıldız, Yaşar Kemal; Tümen, Gülendam (Elsevier Science Bv, 2001)The known ent-kaurene diterpenes 1-9 and a new ent-labdane, ent-6 beta ,8 alpha -dihydroxyl-abda-13(16),14-diene (10), were isolated from the whole plant of Sideritis argyrea. Their structures were elucidated based on one- ... -
Ent-kaurene diterpenes from Sideritis athoa
Topçu, Gülaçtı; Gören, Ahmet Ceyhan; Yıldız, Yaşar Kemal; Tümen, Gülendam (Harwood Acad Publ Gmbh, 1999)Two new and six known ent-kaurene diterpenes were isolated from the whole plant of Sideritis athoa and their structures were elucidated as ent-3 alpha,18-dihydroxykaur-16-ene (1), athonolone (2), ent-3 beta-hydroxykaur-16-ene ... -
Incorporation of an allene unit into 1,4-dihydronaphthalene: generation of 1,2-benzo-1,4,5-cycloheptatriene and its dimerization
Azizoğlu, Akın; Demirkol, Onur; Kılıç, Turgut; Yıldız, Yaşar Kemal (Pergamon-Elsevier Science Ltd, 2007)1-Bromo-1-fluoro-[1a,2,7,7a]-tetrahydro-1H-cyclopropa[b]naphthalene (19) has been prepared by the addition of bromolluoro-carbene to 1,4-dihydronaphthalene (18). Treatment of a solution of 19 in dry ether with MeLi afforded ... -
A new and short synthesis of 7H-benzo[a]cyclohepten-7-one and some derivatives: Oxidation of 7-bromo-5H-benzo[a]cycloheptene
Daştan, Arif; Yıldız, Yaşar Kemal; Balcı, Metin (Marcel Dekker Inc, 2001)Oxidation of 7-bromo-5H-benzo[a]cycloheptene with some oxidation reagents has been studied. Several 2,3- and 4,5-benzotropone derivatives has been obtained. The structures of the products were determined by H-1-, (CNMR)-C-13 ... -
A new synthesis of bromobenzotropones: Oxidation of 8-bromo-5H-benzo[a]cycloheptene
Daştan, Arif; Yıldız, Yaşar Kemal; Kazaz, Cavit; Balcı, Metin (Scientific Technical Research Council Turkey, 2002)The oxidation of 8-bromo-5H-belizo[a]cycloheptene with some oxidation reagents was studied. 2,3-and 4,5-benzotropone derivatives were obtained. The structures of the bromobenzotropones were determined by H-1- and C-13-NMR data. -
Sideritis condensata boiss. & Heldr bitkisinin fitokimyasal analizi
Çarıkçı, Sema (Balıkesir Üniversitesi Fen Bilimleri Enstitüsü, 2005)Türkiye'de 35'i endemik toplam 47 Sideritis türü yetişmektedir. Bu türler halk arasında çay olarak bazı hastalıkların tedavisinde (soğuk algınlığı, yüksek tansiyon, şeker hastalığı, mide ağrıları v.b.) kullanılmaktadır. ... -
Sideritis lycia ve sideritis leptoclada türlerinin diterpen bileşiklerinin izolasyonu ve karakterizasyonu
Kılıç, Turgut (Balıkesir Üniversitesi Fen Bilimler Enstitüsü, 2002)Türkiye'de 35'i endemik toplam 46 Sideritis türü yetişmektedir. Bu çalışmada endemik birer tür olan Sideritis lycia ve S. leptoclada (Labiatae=Lamiaceae) türleri d iterpen bileşikleri yönünden incelenmiştir. Ayrıca çalışma ... -
Solvent effect upon ion-pair extraction of different sodium dyes using some crown ethers
Çakır, Ümit; Çiçek, Baki; Yıldız, Yaşar Kemal; Alkan, Mahir (Springer, 1999)Liquid-liquid extractive-spectrophotometric studies of sodium ion complexes of 18-crown-6(18C6), dibenzo-18-crown-6(DB18C6), 15-crown-5(15C5), and 12-crown-4(12C4) and anionic dyes [4 (2 pyridylazo)-resorcinol monosodium ... -
Trapping of 1,2-benzo-1,3,4-cycloheptatriene as evidence for a strained cyclic allene structure
Yıldız, Yaşar Kemal; Öztürk, Turan; Balcı, Metin (Pergamon-Elsevier Science Ltd, 1999)8-brom-6,7-dihydrobenzocycloheptene 16 and 9-bromo-6,7-benzocycloheptadiene 17 have been synthesized via a new and simple method, and their allene reactions were studied. Treatment of 16 with a base in the presence of DPIBF ...
