摘要:
A novel agent for introducing a protecting group for a hydroxy group and/or a mercapto group that can be introduced and removed under mild conditions is provided. The agent for introducing a protecting group for a hydroxy group and/or mercapto group of a substrate compound having the hydroxy group and/or mercapto group is represented by the following formula (I), wherein A represents a ring structure having 1 to 5 rings in which two carbon atoms of an adjacent benzene ring are included, the ring structure comprises a substituted or unsubstituted five-membered ring or six-membered ring and optionally include a heterocycle; each of R 1 , R 2 , R 3 , and R 4 is independently a hydrogen atom or a linear or branched alkyl group having 1 to 5 carbon atoms; and X is a halogen atom or OSO 2 R 5 (R 5 = an aryl group or an alkyl group) .
摘要:
A tetrafluorotoluene compound represented by the formula (1):
wherein R represents a C1-C6 alkyl group, and a method for producing a tetrafluorotoluene compound represented by the formula (1) which comprises hydrogenating a tetrafluorobenzyl alcohol compound represented by the formula (2):
摘要:
The invention relates to a compound of the following general formula (III):
wherein: R 1 and R 2 each are one or more independent substituents selected from the group consisting of hydrogen, C1-C5 alkyl, C2-C5 alkenyl, C3-C5 cycloalkyl, C1-C5 alkoxy, C2-C5 alkynyl, halogen, C1-C5 haloalkyl, alkylamino, phenyl, nitro and carboxyl; R 3 is selected from the group consisting of amino, C1-C5 substituted amino and CH 2 ; n and m are independently an integer of from 0-5;
or a pharmaceutically acceptable salt of such compound; a compound of the following general formula (IV):
wherein: R 1 and R 2 each are one or more independent substituents selected from the group consisting of hydrogen, C1-C5 alkyl, C2-C5 alkenyl, C3-C5 cycloalkyl, C1-C5 alkoxy, C2-C5 alkynyl, halogen, C1-C5 haloalkyl, alkylamino, phenyl, nitro and ca rboxyl; R 3 and R 4 each are independent and selected from the group consisting of hydrogen and C1-C5 alkyl; n is an integer of from 1 to 5;
or a pharmaceutically acceptable salt of such compound; a compound of the following general formula (V):
wherein: R 1 and R 2 each are one or more independent substituents selected from the group consisting of hydrogen, C1-C5 alkyl, C2-C5 alkenyl, C3-C5 cycloalkyl, C1-C5 alkoxy, C2-C5 alkynyl, halogen, C1-C5 haloalkyl, alkylamino, phenyl, nitro and carboxyl; R 3 is selected from hydrogen and C1-C5 alkyl; R 4 is selected from hydrogen and C1-C5 alkyl; n is an integer of from 1 to 5 inclusive; or a pharmaceutically acceptable salt of such compound; and a compound of the following general formula (VI):
wherein: R 1 and R 2 each are one or more independent substituents selected from the group consisting of hydrogen, C1-C5 alkyl, C2-C5 alkenyl, C3-C5 cycloalkyl, C1-C5 alkoxy, C2-C5 alkynyl, halogen, C1-C5 haloalkyl, alkylamino, phenyl, nitro and carboxyl; R3 and R4 each are independent and selected from hydrogen and C1-C5 alkyl; n is an integer of from 1 to 5 inclusive; or a pharmaceutically acceptable salt of such compound. Also compositions comprising the compounds III-VI as well as uses of said compounds.
摘要:
The invention relates to a method which enables the production of 2,3,5,6-tetrahalogen-xylylidene compounds with favorable yields by diazotizing 2,3,5,6-tetrahalogen-xylylidene diamine.
摘要:
A catalyst composition comprising trifluoromethanesulfonic acid (also referred to as triflic acid) and a sufficient quantity of a substance (also referred to as a retarder) to decrease but not eliminate the catalytic activity of the acid is disclosed. Also disclosed, is a method and composition for condensing a hydroxyaryl with a diene by use of the catalyst composition. The method is capable of producing condensates having: a mole ratio of 1 mole of the diene to one mole of the hydroxyaryl; one mole of diene to two moles of the hydroxyaryl as well as higher molecular weight products such as resins by changes in temperature, time of reaction, type and quantity of retarder and other variables.
摘要:
The invention concerns a monomer of general formula A-(Q-S)p wherein: A = an aromatic or heteroaromatic ring; Q = a carbonaceous or siliceous divalent radical, respectively corresponding to general formulae: (CR1R2)n wherein: R1, R2 = H, alkyl, alkenyl comprising between 1 to 4 carbon atoms and n ranges between 4 and 24; and [O-Si(R1R2)]n wherein R1, R2 = H, alkyl, alkenyl comprising between 1 and 4 carbon atoms and n ranges between 3 and 24; S = a solvating segment consisting of at least an aliphatic chain comprising at least a polar heteroatom. 1≤p≤6. The invention also concerns the polymer (homopolymer or copolymer) incorporating said monomer, and their use in organic electroluminescent devices.
摘要:
Compounds of general formula (1), and a liquid crystal composition containing the same, wherein R and R' are each C1-C10 alkyl, cyano, halogeno or the like; A1, A2, A3 and A4 are each a benzene ring, a C3-C8 cycloalkane ring or the like; at least one of Z1, Z2 and Z3 is an alkenylene group of general formula (Q), (wherein P1 and P2 are each hydrogen or C1-C10 alkyl, with at least one of them being C1-C10 alkyl; and q and r are each 0 to 2, the sum of q and r being 2 or below) and the others thereof are each a covalent bond, -CH2CH2- or the like; and m and n are each 0 or 1. The above compounds exhibit a liquid crystal phase over a wide temperature range, are excellent in compatibility with other liquid crystal compounds and stability, and have a high elastic constant ratio K33/K11.
摘要:
Formation of cerebral amyloid associated with Alzheimer's disease can be treated or averted using medicaments that are effective in vivo in preventing disruption of dense microspheres (DMS) or in altering the disruption so as to (i) reduce the volume of tissue occupied by redistributed, transformed DMS protein material and its associated injury focus; (ii) reduce the persistence or duration of injury and inflammation associated with the disrupted DMS and redistributed transformed DMS protein material; and/or (iii) increase the digestion and removal of DMS material through the reticuloendothelial system.