利用“APT”技术鉴别各种^(13)C—H基

IDENTIFICATION OF ^(13)C-H GROUPS BY USING APT TECHNIQUE

本文介绍了用于FT-80A NMR谱仪的EDIT技术的原理、使用方法和主要参数的设置。从实际中总结出APT参数组中的关键参数LT值的设置是:当LT=6,7或8ms时,得到正常APT^(13)C谱;当LT=4ms时,CH_3碳信号消失;当LT=2.9或3ms,季碳信号的强度大大增强。这一规律普遍适用(炔类衍生物未做测试)。

The principle,application and setting of main parameters on EDIT technique suitable for FT-80A. NMR spectrometers are introduced in this paper.When a set of APT parameters is used, the empirical values for the key parameter, LT, are as follows.1 When set LT to 6, 7 or 8ms, the normal APT 13C spectra can be obtained.2 When set LT to 4ms, the signal of all methyl carboons will vanish3 when set LT to 2.9or3ms,tte intensity of quaternary carbons,compared. with those of the corresponding normal APT 13C spectra, can be greatly enhanced.This rule can be generally applied in the identification of 13C-H groups of all organic compounds ( C=C of alkyne derivatives have not been tested )