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156742-99-3

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156742-99-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 156742-99-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,7,4 and 2 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 156742-99:
(8*1)+(7*5)+(6*6)+(5*7)+(4*4)+(3*2)+(2*9)+(1*9)=163
163 % 10 = 3
So 156742-99-3 is a valid CAS Registry Number.

156742-99-3Relevant articles and documents

Synthetic studies towards Chlorahololides A: practical synthesis of a lindenane-type sesquiterpenoid core framework with a 5,6-double bond

Liu, Yong,Nan, Fa-Jun

scheme or table, p. 1374 - 1376 (2010/05/19)

Towards Chlorahololides A: a lindenane-type sesquiterpenoid framework that contains a 5,6-double bond was synthesized from simple starting materials. The reductive cyclization of a 1,6-enyne and an unusual endo-type intramolecular Heck reaction was used as key steps for ring closure.

Acidic Isomerization of Vicinally Substituted (cis)-Acceptor-Donor Cyclopropanes via an Open Ring Mechanism

Dechoux, Luc,Doris, Eric

, p. 2017 - 2020 (2007/10/02)

Many (cis)-cyclopropanes bearing 1-electronwithdrawing and 2-hydroxymethylene groups were synthesized under mild acidic conditions to afford the corresponding trans isomers.The mechanism is reported.

A simple one-pot preparation of (Z)-cyclopropanes from γ,δ-ketoalkenes using KOH/DMSO intramolecular alkylation conditions

Dechoux, Luc,Ebel, Maurice,Jung, Louis,Stambach, Jean Francois

, p. 7405 - 7408 (2007/10/02)

Sequential treatment of λ,δ-ketoalkenes with aqueous NBS in DMSO and KOH as solid provides (Z)-cyclopropanes in good overall yields with a diastereoselective excess>;99%.

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