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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. 相似文献
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加热炉延寿分析的研究 总被引:2,自引:1,他引:2
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。 相似文献
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