17701-32-5Relevant articles and documents
Skin (by machine translation)
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Paragraph 0043, (2017/12/27)
PROBLEM TO BE SOLVED: To provide a skin external preparation which has an excellent moisture retention effect, and excellent feeling of use without stickiness and strain.SOLUTION: A skin external preparation contains a copolymer that essentially consists of: one or more constitutional units derived from a hydrophobic and acrylic ester-based monomer including one (meth)acryloyl group and a plurality of acyl groups having a specific branch structure; and one or more constitutional units derived from a specific and hydrophilic structural acrylic monomer. The copolymer may have other constitutional units.
Intramolecular insertions into unactivated C(sp3)-H bonds by oxidatively generated β-diketone-α-gold carbenes: Synthesis of cyclopentanones
Wang, Youliang,Zheng, Zhitong,Zhang, Liming
, p. 5316 - 5319 (2015/05/13)
Generation of reactive α-oxo gold carbene intermediates via gold-catalyzed oxidation of alkynes has become an increasing versatile strategy of replacing hazardous diazo carbonyl compounds with benign and readily available alkynes in the development of efficient synthetic methods. However, one of the hallmarks of metal carbene/carbenoid chemistry, i.e., insertion into an unactivated C(sp3)-H bond, has not be realized. This study reveals for the first time that this highly valuable transformation can be readily realized intramolecularly by oxidatively generated β-diketone-α-gold carbenes using ynones as substrates. Substrate conformation control via the Thorpe-Ingold effect is the key design feature that enables generally good to excellent efficiencies, and synthetically versatile cyclopentanones including spiro-, bridged, and fused bicyclic ones can be readily accessed.