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73786-38-6

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73786-38-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 73786-38-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,3,7,8 and 6 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 73786-38:
(7*7)+(6*3)+(5*7)+(4*8)+(3*6)+(2*3)+(1*8)=166
166 % 10 = 6
So 73786-38-6 is a valid CAS Registry Number.

73786-38-6Downstream Products

73786-38-6Relevant articles and documents

New route to 3-(substituted) methyl 1-oxa- and (1-thia)cephems from 3-exomethylene intermediates via sulfenyl chloride adducts

Aoki,Konoike,Itani,et al.

, p. 2515 - 2526 (2007/10/02)

Addition of methane- and benzenesulfenyl chlorides to 3-exomethylene-1-oxacephams 10 and 14 gave 3β-sulfenyl-3α-chloromethyl adducts 11 and 15. Nucleophilic substitution of the adducts proceeded facilely to afford compounds 18-23, which were converted into Δ3-dervatives 26 and 27 by oxidative elimination. This new route, as illustrated by the sequence 6 → 7 → 8 → 3, has an essential advantage in using the saturated intermediated 7 and 8 with a stabler β-lactam ring which is compatible in nucleophilic substitution, alkaline ester hydrolysis and further manipulations. These synthetic features are well demonstrated by successful synthesis of 1-oxacefamandol 35 and 7β-(2-thienylacetyl-amino)-3-(1-methyl-1H-tetrazol-5-yl)thiomethyl-3-ceph em-4-carboxylic acid (45).

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