摘要:
Provided are graphene nanoribbon precursors comprising repeated units of the general formula (I) in which R1, R2 are each H, halogen, —OH, —NH2, —CN, —NO2 or a hydrocarbyl radical which has 1 to 40 carbon atoms and may be linear or branched, saturated or unsaturated and mono- or poly-substituted by halogen (F, Cl, Br, I), —OH, —NH2, —CN, and/or —NO2, where one or more CH2 groups may also be replaced by —O—, —S—, —C(O)O—, —O—C(O)—, —C(O)—, —NH— or —NR—, in which R is an optionally substituted C1C40-hydrocarbyl radical, or an optionally substituted aryl, alkylaryl or alkoxyaryl radical.
摘要:
The invention relates to a process for the preparation of a compound of formula (I), which process comprises a) reacting a compound of formula (II), wherein X is chloro or bromo, with an organometallic species to (III) reacting the halobenzyne of formula (III) so formed with (IV) wherein R1 and R2 are hydrogen or C1-C6alkyl; to (V), b) hydrogenating V in the presence of a metal catalyst to (VI), c) ozonising (VI) to (VII) d) converting (VII) in the presence of a phosphane and CCI4 or CHCI3 to (VIII) (VIII), and either e1) reacting VIII with NH3 in the presence of a catalyst to (IX) and f) reacting IX in the presence of a base with the compound of formula (X), to the compound of formula (I); or e2) reacting the compound of formula (VIII), in the presence of a solvent, a base, a copper catalyst and at least one ligand with (Xa), to the compound of formula (I).
摘要:
Novel emulsions of non-aromatizable perfluorinated compounds are useful as blood substitutes or as perfusion materials for the storage of organs such as kidneys prior to transplant. The compounds employed are polycyclic compounds and emulsions prepared from the perfluorinated derivatives thereof possess extremely high stability, zero or extremely low ultimate residue in the body, and a vapor pressure which is just about right for use in the body without adverse effects thereon.
摘要:
Novel compounds comprising poly(polyhalonorbornenylalkyl)benzene as exemplified by 1,4-bis(1,3,4,5,6,7,7-heptachloro-5-norbornen2-ylmethyl)-benzene are prepared by reacting an aromatic hydrocarbon containing at least two alkyl substituents with 1,2dichloroethylene and thereafter reacting the resultant product with a polyhalo-substituted cycloalkadiene to form the desired compound. These compounds are useful for imparting flame retardant characteristics when admixed with a polymeric substance.
摘要:
Novel brominated adducts of acyclic trienes with halocyclopentadienes and with substituted halocyclopentadienes are disclosed. Methods of preparing said novel compounds are also disclosed.
摘要:
A urea compound of the formula in which R, R1 and R2, when taken as individual radicals, are each hydrogen, chlorine, bromine, an alkyl radical having 1 to 4 carbon atoms or chloromethyl, and when taken as a group, R2 is hydrogen, and R and R1 taken together represent a chemical bond ( - ), -CH2-CH = CH-, or -CH2CHCl-CHCl-, and R3 and R4 are each an alkyl radical having 1 to 8 carbon atoms, is made by contacting a thiourea compound of the formula stepwise with phosgene in a water-free organic solvent at a temperature in the range of 0 DEG to 80 DEG C. and then with water in aqueous medium at a temperature in the range of 0 DEG to 100 DEG C. in the presence of an acid acceptor. The intermediate thiourea compounds are made by contacting an unsaturated norbornene compound with HSCN generated in situ from a salt of thiocyanic acid and a mineral acid in aqueous media, at temperatures below 150 DEG C. to produce a corresponding norbornyl isothiocyanate which is then reacted with a dialkyl amine HNR3R4 at temperatures below 150 DEG C. Suitable chloro-substituted norbornenes are obtained by reacting 2-chloro-1-propene, 2,3-dichloropropene-1, or vinyl chloride is reacted with cyclopentadiene (which may be obtained by depolymerizing dicyclopentadiene). Detailed examples are given. Reference has been directed by the Comptroller to Specifications 890,540.