Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Roger Brettle"'
Publikováno v:
Tetrahedron. 59:4377-4381
Cycloalkenones are shown to be mesogens and can be synthesised in near quantitative yields by a convergent palladium(0)-catalysed cross-coupling strategy; a 2-methyl group induces a change of phase from smectic to nematic.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9074d83590668ec65aca38783e76cdb
https://doi.org/10.1016/s0040-4020(03)00620-3
https://doi.org/10.1016/s0040-4020(03)00620-3
Publikováno v:
Journal of Materials Chemistry. 7:391-401
A new approach to the synthesis of azulene liquid crystals is described based on Hafner’s procedure involving reaction of a pyridinium salt with a cyclopentadienide. The preparation of a variety of liquid crystalline materials using this method is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d7388e168e113b92b4b791d9c00b5563
https://doi.org/10.1039/a606139g
https://doi.org/10.1039/a606139g
Autor:
Martyn Frederickson, Fiona S. MacBeath, Gareth M. Davies, Edwin Haslam, Richard Cross, Roger Brettle
Publikováno v:
Tetrahedron. 52:10547-10556
The use of (−)-shikimic acid as starting material in the syntheses of a series of C-3 halogenated derivatives including the analogous 3α- and 3β-fluoro and 3β-chloro acids is described together with the first stereospecific synthesis of (−)-3-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0085e20054f608a8c4f74b3fc6b98c38
https://doi.org/10.1016/0040-4020(96)00574-1
https://doi.org/10.1016/0040-4020(96)00574-1
Autor:
Edwin Haslam, Gareth M. Davies, Fiona S. MacBeath, Richard Cross, Roger Brettle, Martyn Frederickson
Publikováno v:
Bioorganic & Medicinal Chemistry Letters. 6:1275-1278
(3 R )- and (3 S )-Fluoro-(4 R ,5 R )-dihydroxy-1-cyclohexene-1-carboxylic acids (the (3 R )- and (3 S )-fluoro analogues of (−)-shikimic acid) have been synthesised from (−)-shikimic acid via an intermediate epoxide (a fungal metabolite from Cha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::497e21359131c45be2e5bfece3a61df4
https://doi.org/10.1016/0960-894x(96)00215-6
https://doi.org/10.1016/0960-894x(96)00215-6
Autor:
Martyn Frederickson, Gareth M. Davies, Fiona S. MacBeath, Edwin Haslam, Neil A. Bailey, Roger Brettle, Harry Adams, Richard Cross
Publikováno v:
Tetrahedron. 52:8565-8580
The first successful method for the introduction of nitrogenous functionality at C-3 of the shikimate nucleus has been developed and has allowed the synthesis of (−)-3(R)-amino-4(R),5(R)-dihydroxy-1-cyclohexene-1-carboxylic acid [the 3(R)-amino ana
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::301d59e350c538a8b71b77dc2b0de6ec
https://doi.org/10.1016/0040-4020(96)00398-5
https://doi.org/10.1016/0040-4020(96)00398-5
Publikováno v:
Bioorganic & Medicinal Chemistry Letters. 6:291-294
(−)-3(R)-Amino-4(R),5(R)-dihydroxy-1-cyclohexene-1-carboxylic acid (the 3(R)-amino analogue of (−)-shikimic acid) has been synthesised from (−)-shikimic acid in seven steps.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::960884195644e05fc7209dfd108f038f
https://doi.org/10.1016/0960-894x(96)00011-x
https://doi.org/10.1016/0960-894x(96)00011-x
Publikováno v:
Chemistry Letters. 22:1663-1666
The cyclohex-2-en-1-one unit flanked by one or more aryl rings is shown to provide a new system which can exhibit liquid crystal properties; these new mesogens contain a chiral centre which is both adjacent to a lateral dipolar carbonyl group and is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::068387569eb43de1149f6dd1d13bac89
https://doi.org/10.1246/cl.1993.1663
https://doi.org/10.1246/cl.1993.1663
Publikováno v:
Liquid Crystals. 13:515-529
A general and versatile route to the 2-alkyl-5-(4′-cyanophenyl)thiophenes was established, involving the condensation of an aryl vinyl ketone with an aldehyde in the presence of a thiazolium catalyst (Stetter procedure) to give a 1,4-diketone which
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c6463c2d10f231ca5440faba34c09a9f
https://doi.org/10.1080/02678299308026324
https://doi.org/10.1080/02678299308026324
Publikováno v:
ChemInform. 25
The cyclohex-2-en-1-one unit flanked by one or more aryl rings is shown to provide a new system which can exhibit liquid crystal properties; these new mesogens contain a chiral centre which is both adjacent to a lateral dipolar carbonyl group and is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eaff734a33ab23d23800c295eef45bec
https://doi.org/10.1002/chin.199414142
https://doi.org/10.1002/chin.199414142
Publikováno v:
ChemInform. 25
A general route to potentially mesogenic heterocycles, based on 1-(4-bromophenyl) and 1-(4'-bromobiphenyl)-1,4-dioxoalkanes is described and used to prepare pyrroles, thiophene 1,1-dioxides and pyridazines. No mesogenic compounds were obtained in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1054273fa966fdfb827e21e7b6f9818c
https://doi.org/10.1002/chin.199446061
https://doi.org/10.1002/chin.199446061