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90199-14-7

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90199-14-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 90199-14-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,1,9 and 9 respectively; the second part has 2 digits, 1 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 90199-14:
(7*9)+(6*0)+(5*1)+(4*9)+(3*9)+(2*1)+(1*4)=137
137 % 10 = 7
So 90199-14-7 is a valid CAS Registry Number.

90199-14-7Upstream product

90199-14-7Relevant articles and documents

Synthesis of polycyclic cyclobutane derivatives by tandem intramolecular Michael-aldol reaction under two complementary conditions: TBDMSOTf-Et3N and TMSI-(TMS)2NH

Ihara, Masataka,Taniguchi, Takahiko,Makita, Kei,Takano, Michiko,Ohnishi, Masaru,Taniguchi, Nobuaki,Fukumoto, Keiichiro,Kabuto, Chizuko

, p. 8107 - 8115 (2007/10/02)

The treatment of αβ-unsaturated esters having a ketone function at an appropriate position with either TBDMSOTf in the presence of Et3N or TMSI in the presence of (TMS)2NH provided, via a tandem intramolecular Michael-aldol reaction sequence, several different types of cyclobutane derivatives. The two reaction conditions were complementary. Tricyclo[4.2.1.03,8]nonanes 34 and 55, tricyclo[5.1.104,8]nonane 40, tricyclo[5.4.0.03,7]undecane 51, tetracyclo[5.4.0.03,7.09,11]undecane 45, and the bicyclo[3.2.0]heptanes 56, 57, and 58, which have structures either partially or completely similar to those of endiandric acids A (1a), B (1b), and C (2), trihydroxydecipiadiene (3), lintenone (4), italicene (5), and filifolone (6), were stereoselectively synthesized by the tandem reaction.

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