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A Laser Flash Photolysis Study of Dibromocarbene and Bromochlorocarbene

机译:二溴卡宾和溴氯卡宾的激光闪光光解研究

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摘要

Laser flash photolysis (LFP, XeCl, 308 nm) of 11, 11-dibromotricyclo[4. 4. 1. 0~(1.6)]undeca-2, 4, 8-triene (1) or 10, 10-dibromotricyclo[4. 3. 1. 0~(1.6)]deca-2, 4-diene (2a) produces CBr_2 and an aromatic compound. Bromochlorocarbene is produced by LFP of 10-bromo-10-chlorotricyclo[4. 3. 1. 0~(1.6)]deca-2, 4-diene (2b). The carbenes are trapped by pyridine to form ylides. The lifetimes of CBr_2 and CBrCl and their absolute reactivities toward pyridine and alkenes have been determined. The relative reactivity of CBr_2 toward alkenes determined by LFP methods is in excellent agreement with that determined previously by chemical analysis of reaction mixtures, and the rate constant data reveal that the absolute reactivity of CBrCl more closely resembles that of CBr_2 rather than that of CCl_2.
机译:11,11-二溴三环的激光闪光光解(LFP,XeCl,308 nm)[4。 4. 1. 0〜(1.6)] undeca-2,4,8,8-三烯(1)或10,10-二溴三环[4。 3. 1. 0〜(1.6)] deca-2,4-二烯(2a)生成CBr_2和芳香族化合物。溴氯卡宾是由10-溴-10-氯三环的LFP生产的[4。 3. 1. 0〜(1.6)] deca-2,4-二烯(2b)。卡宾被吡啶捕获而形成叶立德。确定了CBr_2和CBrCl的寿命及其对吡啶和烯烃的绝对反应性。通过LFP方法测定的CBr_2对烯烃的相对反应性与先前通过反应混合物的化学分析确定的相对反应性非常一致,并且速率常数数据显示CBrCl的绝对反应性与CBr_2的绝对反应性更接近,而不是CCl_2的绝对反应性。

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