本发明用固体光气代替了一级剧毒性气体――光气,便于准确计量,优化了操作条件,对环境污染小;
The present invention uses solid phosgene, rather than phosgene to result in accurate metering, optimized operation condition and less environmental pollution.
三光气作为剧毒的光气和双光气在合成中的替代物,不但毒性低,使用安全方便,而且反应条件温和、选择性好、收率高。
The triphosgene, being as the substitute for phosgene and diphosgene in synthesis, is not only low-toxic but also safe and convenient to use with mild conditions, good selectivity and high yields.
尽管毒性有所不同,但毫无疑问的是它们都是带有剧毒的。
All known pit vipers are venomous, although their potency varies across species.
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