Deprotection of benzyl and p-methoxybenzyl ethers by chlorosulfonyl isocyanate–sodium hydroxide
摘要:
CSI-NaOH procedure provided a new and mild methodology for the deprotection of benzyl and p-methoxybenzyl ethers without affecting the other functional groups under similar reaction conditions. (C) 2003 Elsevier Science Ltd. All rights reserved.
On the loss of a benzyl radical from the molecular ion of α,ω -dibenzyloxyalkanes
作者:A.P. Bruins、N.M.M. Nibbering
DOI:10.1016/s0040-4020(01)97030-9
日期:1974.1
The molecularions of the title compounds appear to lose a benzyl radical, which must be due to the presence of two benzyloxy groups, as benzylalkyl ethers do not exhibit such an expulsion upon electron impact. The results of the partition of the labels deuterium and 18O in the ions m/e 107 (protonated benzaldehyde) and [M-benzyl-benzaldehyde]+ put forward evidence that this process is initiated by
标题化合物的分子离子似乎丢失了苄基,这必须归因于两个苄氧基的存在,因为苄基烷基醚在电子撞击时不会表现出这种驱逐作用。标记氘和18 O在离子m / e 107(质子化的苯甲醛)和[M-苄基-苯甲醛] +中的分配结果表明,该过程是由苄基H原子连续迁移至在S N i型反应中,醚的功能相反,苄基阳离子从该质子化的O原子转移至不带电荷的O原子(参见方案5)。
Novel Ammonium Ionophores Based on Glycol Dibenzyl Ethers for an Ion-Selective Electrode
Based on the finding that dibenzyl ether (DBE) exhibited a relatively high selectivity for ammonium ion relative to potassium ion, four types of dibenzyl ethers were synthesized and their ammonium ion selectivities over alkali and alkaline-earth metal ions were examined with potentiometric measurements.
Selective monoetherification and monoesterificatton of diols and diacids under phase-transfer conditions
作者:Jaime de la Zerda、Gabriela Barak、Yoel Sasson
DOI:10.1016/0040-4020(89)80151-6
日期:1989.1
Research on the selectivity of etherlfication reactions of diols and esterification reactions of diacids by alkyl halides underphase-transfer catalysis has shown that under such conditions, selectivity of monoetherification increases in the order prim < sec < tert diols, though overall yield of monoether decreases from sec to tert diols. Monoesterification of diacids was accomplished with a high degree
A protocol is described for the reductive cleavage of the C–O bond of aromatic and aliphatic acetals to ethers catalyzed by Cu(OTf)2 or Bi(OTf)3 at room temperature in excellent yields, without affecting aromatic rings, nitro, nitrile, ester and hydroxyl groups. This protocol represents an improvement in terms of atom economy compared to the previous methods, by distinctly decreasing the amount of