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13C chemical shifts and 13C13C coupling constants of some alkyl(aryl)sulphonates

✍ Scribed by C. Millot; J. Brondeau; D. Canet

Publisher
John Wiley and Sons
Year
1986
Tongue
English
Weight
237 KB
Volume
24
Category
Article
ISSN
0749-1581

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✦ Synopsis

The attachment of an ester group at C-4 (1) and lactone bridges between C-6 and C-8 (1); C-2 and C-4, C-6 and C-8 (2); C-4 and C-6 (4) resulted in C-4, C-5 and C-6 showing similar chemical shifts in all three structures. In Diosbulbins A (1) and B (Z), C-12 bearing the equatorial furan ring is in an R configuration: while the configuration of the same carbon in Diosbulbins D (3) and G (4) is the opposite.6

During this investigation it was found that the APT was very sensitive to J values. This, therefore, required several experiments to be performed to obtain the correct results. The DEPT rneth~d,'~ which could have overcome these difficulties, was not availble to us at the time of this investigation.

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