50666-68-7Relevant academic research and scientific papers
Switchable synthesis of cyclic carbamates by carbon dioxide fixation at atmospheric pressure
Toda, Yasunori,Shishido, Minoru,Aoki, Tatsuya,Sukegawa, Kimiya,Suga, Hiroyuki
supporting information, p. 6672 - 6675 (2021/07/13)
The base-promoted switchable synthesis of five- and six-membered cyclic carbamates using atmospheric pressure carbon dioxide as the C1 source was developed. The chemoselectivity of products was simply controlled by changing bases and solvents. The reaction proceeds effectively under mild conditions, affording valuable cyclic carbamates. Experimental results and DFT studies revealed the reaction mechanism.
The illumination optical system, the exposure device and method of manufacturing the device
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, (2007/10/05)
PROBLEM TO BE SOLVED: To provide: an illumination optical system adjusting the pupil intensity distribution on an irradiated surface; an aligner; and a method of manufacturing device. SOLUTION: The illumination optical system 13 includes: an optical integrator 28 for forming a secondary light source 30 on an illuminated pupil surface 29 in an illumination optical path of the illumination optical system 13 in the case where an exposing light EL from a light source device 12 is incident; a light-shielding unit constituted of a plurality of mutually displaceable light-shielding members which are disposed in an optical path of the exposing light EL emitted from the secondary light source 30 such that quantities of shielded light are different from one another depending on the incidence angle of the exposing light EL; and a replacement mechanism 59 individually displacing the light-shielding members in the light-shielding unit in the optical path of the exposing light EL. COPYRIGHT: (C)2010,JPOandINPIT
Preparation of 3-Azetidinols with Non-Bulky 1-Alkyl Substituents
Higgins, Robert H.,Eaton, Quentin L.,Worth, Leroy,Peterson, Myra V.
, p. 255 - 259 (2007/10/02)
Cyclization of either the tetrahydropyranyl or trimethylsilyl ether of 1-(alkylamino)-3-chloro-2-propanols 1 followed by cleavage of the azetidinyl ether provides a general method for the preparation of 1-alkyl-3-azetidinols.Unhindered amines provide a more facile preparation of derivatives of 1, or its ethers, than do hindered amines, while hindered derivatives of 1 undergo more facile ring closure.
