One-pot synthesis of 4-substituted 4-alkoxy-1,4-dihydro-3,1-benzoxazine-2-thiones by the reaction of 2-isothiocyanatobenzoates with organolithiums

An efficient one-pot procedure for the preparation of 4-substituted 4-alkoxy-1,4-dihydro-3,1-benzoxazine-2-thiones from 2-isothiocyanatobenzoates has been developed. Thus, 2-isothiocyanatobenzoates were reacted with organolithiums including lithium enolates of acetates and tertiary acetamides in THF at −78 °C to give the desired products in generally good yields.     

加热炉延寿分析的研究

本文从材料的显微组织，宏观缺陷，化学成分，力学性能等方面，对已服役近１０万小时的９Ｃｒ１Ｍｏ炉管进行了延寿分析研究。结果表明；若仅从蠕变损伤的角度考虑，在正常工况下Ｆ３０１加热炉还有相当长的使用寿命。