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1213-78-1

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1213-78-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1213-78-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,2,1 and 3 respectively; the second part has 2 digits, 7 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 1213-78:
(6*1)+(5*2)+(4*1)+(3*3)+(2*7)+(1*8)=51
51 % 10 = 1
So 1213-78-1 is a valid CAS Registry Number.

1213-78-1Downstream Products

1213-78-1Relevant articles and documents

Synthesis of 1H-inden-1-ol derivatives via rhodium-catalyzed annulation of o-acylphenylboronic acids with alkynes

Matsuda, Takanori,Makino, Masaomi,Murakami, Masahiro

, p. 1416 - 1417 (2005)

A rhodium-catalyzed annulation reaction of o-formyl-phenylboronic acid with alkynes occurred regioselectively at room temperature to give substituted 1H-inden-1-ol derivatives. o-Acetylphenylboronic acid also underwent the annulation reaction at 80°C to a

Cobalt-catalyzed regioselective carbocyclization reaction of o-iodophenyl ketones and aldehydes with alkynes, acrylates, and acrylonitrile: A facile route to indenols and indenes

Chang, Kuo-Jui,Rayabarapu, Dinesh Kumar,Cheng, Chien-Hong

, p. 4781 - 4787 (2004)

An efficient cobalt-catalyzed carbocylization for the synthesis of indenols and indenes and a new method for reductive decyanation are described. 2-Iodophenyl ketones and aldehydes 1a-g undergo carbocyclization with various disubstituted alkynes 2a-k in the presence of Co(dppe)I2 and zinc powder in acetonitrile at 80 °C for 3 h to afford the corresponding indenol derivatives 3a-s and 4a-m in good to excellent yields. For some unsymmetrical alkynes, the carbocyclization was remarkably regioselective, affording a single regioisomer. The cobalt-catalyzed carbocyclization reaction was successfully extended to the synthesis of indene derivatives. Thus, the reaction of 2-iodophenyl ketones and aldehydes (1) with acrylates H2C=CHCO 2R (7a-d) and acrylonitrile H2C= CHCN (7e) proceeds smoothly in the presence of Co(dppe)Cl2/dppe and zinc powder in acetonitrile at 80 °C for 24 h to afford the corresponding indenes 8a-k and 9a-c in moderate to good yields. Interestingly, when 7e was employed for the carbocylization, reductive decyanation also occurred to give an indene derivative without the cyano functionality. A possible mechanism for this cobalt-catalyzed carbocyclization reaction is also proposed.

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