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29Si-29Si Long Range Couplings in Strained Cyclic Polysilanes

✍ Scribed by Mutsumi Kuroda; Dr. Yoshio Kabe; Dr. Masayuki Hashimoto; Prof. Dr. Satoru Masamune


Book ID
102726769
Publisher
John Wiley and Sons
Year
1988
Tongue
English
Weight
574 KB
Volume
27
Category
Article
ISSN
0044-8249

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Geminal 2J(29Si-O-29Si) couplings in oli
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## Abstract Absolute values of (79) geminal ^2^__J__(^29^Si‐O‐^29^Si) couplings were measured in an extensive series of (55) unstrained siloxanes dissolved in chloroform‐__d__. Signs of ^2^__J__(^29^Si‐O‐^29^Si) in some (9) silicon hydrides were determined relative to ^1^__J__(^29^Si‐^1^H) which ar

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## Abstract The absolute values of spin–spin couplings between ^29^Si nuclei in siloxanes, ^2^__J__(^29^SiO^29^Si), were determined. The couplings are small and cover a narrow range of values (0–5 Hz). The coupling constants depend on the branching or on the number of electronegative substituents

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## Abstract The gradient pulse sequences for measurement of small long‐range couplings between heteronuclei (^29^Si^13^C) in natural abundance reported to date (INEPT‐(Si,C)gCOSY and INEPT‐(Si,C,Si)HMQC) suffer from significant signal loss when these nuclei (^29^Si, ^13^C) are coupled through one‐