Rates of cleavage of arylalkylthioethers attached to acetyl-cysteine-methylamide and forming cations or olefins were measured under conditions usual in peptide chemistry in TFA, 5·5 m or 0·2 m HBr/glacial acetic acid and in iodine/methanoi. In 5·5 m HBr/glacial acetic acid trityl, α-methylbenzhydryl and α,α-dimethylbenzyl were removed quickly and almost independently of benzhydryl or 4,4′-dimethoxybenzhydryl
在肽
化学中通常的条件下,在TFA,5·5 m或0·2 m HBr /
冰醋酸和
碘/
甲烷中,测定与乙酰基-半胱
氨酸-甲酰胺连接的芳基烷基
硫醚的裂解速率和形成阳离子或烯烃的裂解速率。在5·5 m的HBr /
冰醋酸三苯甲基中,α-甲基苯甲基和α,α-二甲基苄基被快速去除,几乎与苯甲基或4,4'-二
甲氧基苯甲基无关。后者在
苯甲醚或
苯酚的存在下很容易除去。通过
碘三苯甲基快速除去4,4'-二
甲氧基苯甲酰基和α,4,4'-三甲基苯甲酰基。