4233-18-5Relevant articles and documents
Oxyallyl Exposed: An Open-Shell Singlet with Picosecond Lifetimes in Solution but Persistent in Crystals of a Cyclobutanedione Precursor
Kuzmanich, Gregory,Spaenig, Fabian,Tsai, Chao-Kuan,Um, Joann M.,Hoekstra, Ryan M.,Houk,Guldi, Dirk M.,Garcia-Garibay, Miguel A.
supporting information; scheme or table, p. 2342 - 2345 (2011/05/04)
Photoinduced decarbonylation of 2,4-bis(spirocyclohexyl)-1,3- cyclobutanedione 1 in the crystalline solid state resulted in formation of a deep blue transient with λmax = 550 nm and a half-life of 42 min at 298 K, identified as kinetically stabilized oxyallyl. Support for an open-shell singlet species was obtained by spectroscopic analysis and (4/4) CASSCF calculations with the 6-31+G(d) basis set and multireference MP2 corrections. The electronic spectrum of the singlet biradical, confirmed by femtosecond pump-probe studies in solution, was matched by coupled cluster calculations with single and double corrections.
Insights into the general and efficient cross McMurry reactions between ketones
Duan, Xin-Fang,Zeng, Jing,Lue, Jia-Wei,Zhang, Zhan-Bin
, p. 9873 - 9876 (2007/10/03)
The selective cross McMurry couplings of diaryl or aryl ketones with various substituted ketones were achieved in 53-94% isolated yields. It is believed that the strong affinity of the substituents to the low-valent titanium surface plays an important role in regards to moderating selectivity. Through the introduction of such substituents followed by their removal post McMurry coupling, structurally similar ketones can be effectively cross-coupled.
Studies on the Pinacol Coupling Reaction
Mundy, Bradford P.,Srinivasa, Ramanujan,Kim, Youseung,Dolph, Thomas,Warnet, Ronald J.
, p. 1657 - 1661 (2007/10/02)
The mixed pinacol coupling reaction has been carefully analyzed.Although a trend toward statistical distribution of products can be found, it is observed that true statistical distributions are rarely observed.Ring-size and alkyl substituent effects are examined.A through-space heteroatom influence on coupling is noted.By use of (R)-(+)-3-methylcyclohexanone, a very specific effect of coupling conditions on product stereochemistry is observed.
