598-26-5Relevant articles and documents
Environment Effects on the ESR Spectrum of the Cation Radical of Dimethylketene in Low Temperature Matrices
Fujisawa, Jun,Shimokoshi, Kazuo,Shida, Tadamasa
, p. 1267 - 1272 (1985)
The cation radical of dimethylketene produced in γ-irradiated solid solutions of various halocarbons has been investigated by ESR over a temperature range from 77 K to the melting point of each matrix.The cation radical in CCl4 was stable up to about 180 K and the spectrum was well resolved to allow the determination of the anisotropic ESR parameters.In CCl2FCClF2 and CCl2FCCl2F, a series of irreversible spectral changes was observed with an increase in temperature.This process was interpreted in terms of the formation of the dimer cation.In the matrix of CCl3F, the ESR spectrum exhibited extra structure, which varied reversibly with temperature.The analyses of the spectra suggested that the cation radical in CCl3F weakly interacts with surrounding matrix molecules to form adducts.
Lessons in Strain and Stability: Enantioselective Synthesis of (+)-[5]-Ladderanoic Acid
Hancock, Erin N.,Kuker, Erin L.,Tantillo, Dean J.,Brown, M. Kevin
supporting information, p. 436 - 441 (2019/11/25)
The synthesis of structurally complex and highly strained natural products provides unique challenges and unexpected opportunities for the development of new reactions and strategies. Herein, the synthesis of (+)-[5]-ladderanoic acid is reported. En route to the target, unusual and unexpected strain release driven transformations were uncovered. This occurrence required a drastic revision of the synthetic design that ultimately led to the development of a novel stepwise cyclobutane assembly by an allylboration/Zweifel olefination sequence.
PROCESS FOR PREPARING 2,2,4,4-TETRAMETHYL-1,3-CYCLOBUTANEDIOL
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Paragraph 0075-0093, (2019/10/22)
The present invention refers to 2, 2, 4, 4 - tetramethyl - 1, 3 - cyclohexanedimethanol bhutan d this year a number bath method disclosure as follows. the method (A) meta acrylic acid (methacrylic acid, MAA) removed from the raw material (B) use as an intermediate in the mote [lik [lik] it buys [...] (isobutyric acid, IBA), 2, 2, 4, 4 - tetramethyl - 1, 3 - cyclohexanedimethanol [...] (C) dimethyl ketene (dimethyl Ketene, DMK) and (D) (2, 2, 4, 4 a-tetramethyl-a 1, 3 non-cyclobutanedione, CBDK) via a final material sequentially (E) 2, 2, 4, 4 - tetramethyl bhutan d this year cycle - 1, 3 - (2, 2, 4, 4 a-tetramethyl-a 1, 3 non-cyclobutanediol, CBDO) bath a number comprise substrate. According to the present invention number bath step optimization and a green protective environmental 2, 2, 4, 4 - tetramethyl - 1, 3 - cyclohexanedimethanol bhutan d this year through mirror number is encoded number bath method is highly lipophilic ball number. (by machine translation)
Tfoh-catalyzed formal [3 + 2] cycloaddition of cyclopropane 1,1-diesters with nitriles
Cui, Bo,Ren, Jun,Wang, Zhongwen
, p. 790 - 796 (2014/04/03)
A triflic acid-catalyzed formal [3 + 2] cycloaddition of cyclopropane 1,1-diesters with nitriles was developed. This reaction was expeditious, and the scope of the substituents in both cyclopropanes and nitriles was broad. This supplies an efficient and practical method for the synthesis of 1-pyrrolines.
