1,1-Bis(n-butyl)-2,3,4,5-tetraphenyl-1-silacyclopentadiene (3) and 1,1-bis(t-butyl)-2,3,4,5- tetraphenyl-1-silacyclopentadiene (4) are synthesized from the reaction of the versatile silole dianion (2) with n-butyl bromide and t-butyl bromide. Reduction of (3) and (4) with an excess of lithium to give 1,1-bis(n-butyl)-2,5-dilithio-2,3,4,5-tetraphenyl-1- silacyclopenta-3-enide (6) and 1,1-bis(t-butyl)-2,5-dilithio-2,3,4,5-tetraphenyl-1-silacyclopenta-3-enide (7). 13C-NMR study of two 2,5- carbodianions (6 and 7) shows tert-carbanion at 73.18 and 78.12 ppm respectively. Two bulky tert- butyl groups in (7) increase the inversion barrier at the tert-carbanion, line broadenings of tert-butyl groups in 1H and 13C-NMR spectrum are observed.
목차
Abstract 1. Introduction 2. Experimental Section 2.1. General Procedures 2.2. 1,1-bis(n-butyl)-2,3,4,5-tetraphenyl-1-silacyclopentadiene(3). 2.3. 1,1-Bis(t-butyl)-2,3,4,5-tetraphenyl-1-silacyclopentadiene(4). 2.4. NMR Study of the Reduction of (3) and (4) with Lithium in THF-d8. 3. Results and Discussion 3.1. Preparation of 1.1-bis(n-butyl/t-butyl)-2,3,4,5-tetraphenyl-silacyclopentadiene 3.2. Reduction of 1.1-bis(n-butyl/t-butyl)-2,3,4,5-tetraphenyl-silacyclopentadiene and NMR Study of their Reduced Species 3.3. NMR Study of their Reduced Species (6 and7) of 1.1-bis(n-butyl/t-butyl)-2,3,4,5-tetraphenyl-silacyclopentadiene 3.4. Inversion of tert-carbanions in (6) and (7) 4. Conclusions Acknowledgments References
키워드
Siloletert-Carbanion25-CarbodianionInversion
저자
Jang-Hwan Hong [ Department of Nanopolymer Material Engineering, Pai Chai University ]
Corresponding author
조선대학교 기초과학연구원 [The Natural Science Research Institute of Chosun]
설립연도
2008
분야
자연과학>자연과학일반
소개
본 연구원은 기초과학을 진흥하기 위한 연구·교육 및 그 보급을 목적으로 한다. 이 목적을 달성하기 위하여 다음 각 호의 사업을 수행한다.
1. 기초과학 제 분야에 관한 조사와 연구
2. 기초과학에 관한 학술행사(학술대회, 학술세미나, 심포지엄, 초청강연회 등) 개최
3. 학문후속세대 및 일반인을 위한 기초과학 교육
4. 기관지『조선자연과학논문지』 발간
5. 『자연과학연구총서』, 『자연과학번역총서』 등 단행본 발간
6. 기타 본 연구원의 목적과 관련된 사업
간행물
간행물명
통합자연과학논문집(구 조선자연과학논문집) [Journal of Integrative Natural Science]