debunk 发表于 2025-3-25 04:27:06
http://reply.papertrans.cn/83/8294/829323/829323_21.png文字 发表于 2025-3-25 11:02:24
new ring system (IS) as well as elimination (E), arise from anchimeric assistance by a NG and the ring heteroatom, respectively. The latter either causes substitution with retention of configuration (AS) or migration, to the reaction centre, of the participating group (MS). Special types result whenSpongy-Bone 发表于 2025-3-25 15:10:51
G. R. Berridgeted are the alcohols derived by reduction of the carbonyl groups of the initially formed cyclohexanones. The reactions have been used in the synthesis of a wide range of inositols, their derivatives, and other compounds containing functionalized cyclohexane rings.陪审团 发表于 2025-3-25 17:34:58
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G. R. Berridgen concept and content this Major Reference Work received an essential improvement and expansion. Whereas chapter 1, 2, 3, 7, 8, and 9 are updated, expanded and rearranged versions of the 1st edition, many new subchapters are included in the chapters on monosaccharides, oligosaccharides and polysacchKeshan-disease 发表于 2025-3-26 04:46:11
n concept and content this Major Reference Work received an essential improvement and expansion. Whereas chapter 1, 2, 3, 7, 8, and 9 are updated, expanded and rearranged versions of the 1st edition, many new subchapters are included in the chapters on monosaccharides, oligosaccharides and polysacchMURKY 发表于 2025-3-26 09:27:14
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The American Reprievehought that on political and security matters the UN’s significance lay in the sphere of propaganda rather than diplomacy, have already been described in Chapter 2. However, as intimated at the end of that chapter, in late 1986 and early 1987 there were unmistakable signs that the White House, the S任意 发表于 2025-3-26 17:41:19
The Afghanistan Accordshe superpowers, it was agreed that ‘foreign’ (i.e. Russian) troops would be withdrawn in stages between 15 May and 15 February 1989, and also that the good offices of the UN Secretary-General should be employed to ensure full implementation of the accords. (For the full text of the accords, see Appe