atrophy
发表于 2025-3-25 04:41:37
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ASSAY
发表于 2025-3-25 10:19:39
Miscellaneous Macrocycles,Although it has been known for many years that ethylene oxide and formaldehyde can form statistical copolymers, it was not until the interest in crown ethers developed that the potential of macrocyclic formals as complexing agents was recognized.
FUSE
发表于 2025-3-25 12:51:15
Reactivity and Structure: Concepts in Organic Chemistryhttp://image.papertrans.cn/m/image/620974.jpg
intolerance
发表于 2025-3-25 16:08:24
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COUCH
发表于 2025-3-25 22:22:43
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提名的名单
发表于 2025-3-26 02:16:54
Open-chained Equivalents of Crown Ethers,there is considerable literature in this area, much of it relates to the use of simple polyethylene glycols in phase transfer processes. Since our main concern in this monograph is with novel structures, we will discuss these simple examples further only briefly, below.
infringe
发表于 2025-3-26 08:20:14
Book 1982perspective, at least two rational reasons for conducting this cataloging and organizational effort. The first of these is the obvious fact that a very large number of macrocyclic polyethers have now been prepared and nowhere is there a comprehensive listing of them. A number of excellent reviews ha
Salivary-Gland
发表于 2025-3-26 09:21:27
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antiquated
发表于 2025-3-26 13:37:10
Cryptands and Related Polycyclic Systems,ffording the macrobicyclic diamide . in 45% yield. Reduction using diborane afforded the compound called -cryptand (.) as its bis-borane adduct. Removal of the borane residues could be effected by treatment with 6 N HC1 affording . in more than 90% yield from .. The overall yield for the process was about 25%.
jagged
发表于 2025-3-26 18:44:05
The Template Effect,en reported involve less than dilute if not very concentrated conditions.. The success of these large-ring intramolecular S.2 reactions is generally attributed to the operation of a “template” effect during crown synthesis.