Polydiamondoids
The term "diamondoid" refers to substituted and unsubstituted caged compounds of the adamantane series including substituted and unsubstituted adamantane, diamantane, triamantane, tetramantane, pentamantane, hexamantane, heptamantane, octamantane, nonamantane, decamantane, undecamantane, and the like and also including various molecular weight forms of these components and including isomers of these forms. Substituted diamondoids preferably comprise from 1 to 10 and more preferably 1 to 4 alkyl substituents. "Diamondoids" include "lower diamondoids" and "higher diamondoids".”
“The term "lower diamondoids" or "adamantane, diamantane and triamantane" refers to any and/or all unsubstituted and substituted derivatives of adamantane, diamantane or triamantane. These lower diamondoids show no isomers and are readily synthesized, distinguishing them from the "higher diamondoids".”
[Liu, Carlson and Dahl, US Patent 7,884,256 (2/8/2011)]
“Adamantaneis a colorless, crystalline chemical compounds with a camphor-like odor. With a formula C10H16, it is a cycloalkane and also the simplest diamondoid. Adamantane molecules consist of three cyclohexane rings arranged in the "armchair" configuration. It is unique in that it is both rigid and virtually stress-free. Adamantane is the most stable among all the isomers with formula C10H16, which include the somewhat similar twistane. The spatial arrangement of carbon atoms is the same in adamantane molecule and in the diamond crystal. This motivates the name adamantane, which is derived from the Greek adamantinos (relating to steel or diamond).” (Wikipedia, Adamantane, 8/20/2011)
Recent US Patents
9/20/2011
8,022,151
Adamantane derivative, method for producing the same, resin composition containing the adamantane derivative and use thereof
Okada, Ono and Ito of Idemitsu Kosan, Japan, developed an adamantane derivative giving a cured product excellent in optical characteristics such as transparency and light resistance, durabilities such as heat resistance, and electrical characteristics such as dielectric constant; a method of producing the adamantane derivative; a resin composition containing the adamantane derivative and an epoxy resin curing agent; and a sealing agent for an optical semiconductor. (RDC 9/25/2011)
2/8/2011
7,884,256
Polymerizable higher diamondoid derivatives
Liu, Carlson and Dahl of Chevron, California, has developed higher diamondoid derivatives capable of taking part in polymerization reactions are disclosed as well as intermediates to these derivatives, polymers formed from these derivatives and methods for preparing the polymers. (RDC 8/19/2011)