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176509-34-5

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176509-34-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 176509-34-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,6,5,0 and 9 respectively; the second part has 2 digits, 3 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 176509-34:
(8*1)+(7*7)+(6*6)+(5*5)+(4*0)+(3*9)+(2*3)+(1*4)=155
155 % 10 = 5
So 176509-34-5 is a valid CAS Registry Number.

176509-34-5Relevant articles and documents

Reactions of carbene intermediates from the reaction of trialkyl phosphites with dialkyl benzoylphosphonates: Intramolecular cyclisations of 2-substituted dialkyl benzoylphosphonates

Griffiths, D. Vaughan,Griffiths, Penelope A.,Karim, Khalku,Whitehead, Belinda J.

, p. 555 - 561 (2007/10/03)

The reaction of dialkyl benzoylphosphonates 1 with trialkyl phosphites leads to the formation of carbene intermediates 3 via the anionic intermediates 2. The carbene intermediates 3 (R = 2-PhO, 2-PhOCH2, and 2-PhS) have been generated by heating the corresponding 2-substituted dialkyl benzoylphosphonates with trimethyl phosphite and their subsequent reactions investigated. Reactions proceed either by intermolecular trapping of the carbene intermediates by trimethyl phosphite to give novel ylidic phosphonates 4, or by intramolecular routes involving carbene insertion into the π-system of the phenyl ring in the substituent. Studies using methyl-substituted derivatives have shown that the formation of the thioxanthenylphosphonate 15 (X = S, R′ = R″ = Me) proceeds via a spiro diene intermediate 14 (X = S, R′ = R″ = Me).

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