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1-Bromo-1-phenyl-2,2,3,3-tetramethylcyclopropane is a complex organic compound characterized by a cyclopropane ring, which is a three-carbon ring structure. This molecule features a bromine atom attached to one of the carbons in the ring, and a phenyl group (a benzene ring) attached to the adjacent carbon. The molecule also has four methyl groups (CH3), with two of them attached to the carbons adjacent to the bromine and phenyl groups, and the other two attached to the remaining carbon in the ring. 1-bromo-1-phenyl-2,2,3,3-tetramethylcyclopropane is known for its unique structure and potential applications in organic synthesis, particularly in the formation of strained ring systems and as a precursor in the synthesis of various pharmaceuticals and agrochemicals. Due to its reactivity and the presence of a bromine atom, it can also be used in substitution reactions to form a variety of derivatives.

4920-72-3

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4920-72-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 4920-72-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,2 and 0 respectively; the second part has 2 digits, 7 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 4920-72:
(6*4)+(5*9)+(4*2)+(3*0)+(2*7)+(1*2)=93
93 % 10 = 3
So 4920-72-3 is a valid CAS Registry Number.

4920-72-3Relevant academic research and scientific papers

ABSOLUTE RATE CONSTANTS FOR THE ADDITIONS OF HALOPHENYLCARBENES TO ALKENES; A REACTIVITY-SELECTIVITY RELATION

Cox, D. Phillip,Gould, Ian R.,Hacker, Nigel P.,Moss, Robert A.,Turro, Nicholas J.

, p. 5313 - 5316 (1983)

The absolute rate constants determined for the additions of FCPh, ClCPh, and BrCPh to Me2C=CMe2, Me2C=CHMe, trans-MeCH=CHEt, and n-BuCH=CH2, appear to follow a reactivity/selectivity pattern of the "normal" (inverse) type.

Volumes of Activation for the Cycloaddition Reactions of Phenylhalocarbenes to Alkenes

Turro, Nicholas J.,Okamoto, Masami,Gould, Ian R.,Moss, Robert A.,Lawrynowicz, Witold,Hadel, Linda M.

, p. 4973 - 4976 (2007/10/02)

The absolute rate constants for the cycloaddition reactions of three arylhalocarbenes to two alkenes have been measured as a function of pressure in the range 0.1 to 203 MPa.In all cases the observed rate constants were found to increase with increasing pressure.The magnitude of the derived activation volumes falls in the range of -10 to -18 cm3/mol and does not depend on solvent.The results rule out a late, two-bond transition state and a bipolar single-bond transition state but are consistent with the reversible formation of a carbene-alkene complex or an early one- or two-bond transition state.

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