Polyketal

Kelsey et al. reported that die cyclic ketal of 4,4,-dihydroxybenzophenone (DHBP) can polymerize with 4,4,-difluorobenzophenone in DMAc at 150°C (Scheme 6.16).85 The polymerization afforded soluble amorphous polyketal that was quantitatively converted to PEK. Because of relatively lower reaction temperature, the PEK had minimal defect structures and thus possesses higher crystallinity and higher Tg, and has better physical properties than its counterpart made under higher temperatures. [Pg.342]

Polyket macrolides 27-29 membered (African termite Pseudacanthotermes spiniger Plasman 1999) naphthoQuinones granaticin Streptomyces olivaceus, Actinom., Bad. from soil in W Africa Ml) orthosomicins eveminomicin (Micromonospora carbonacea var. qfricana, Bact. frtan Kenya Nicolaou 1999)... [Pg.24]

Other macrocyclic polyket naracvclophanes cylindrocyciophanes (Cylindrospermum licheniforme Kutzing, Nostocales, from American Type Culture Collection, and nostocyclophanes from Nostoc linckia (Roth) Bomet ex Bomet Flahault, from Univ. of Texas Culture Collection, freshwater Cyanobact. Hoye 2000). [Pg.32]

Fatty acid/polyket agaricic-acid-like (Fames laricis (Jacq.), Basidiomyc., Eumyc. fron Euri ean and Russian northern conifer forest MI) maltol-like maltol (y-pyrone from Pinaceae, Gymn. from foe conifer fi)rest MI). [Pg.34]

Simple polyket. didemnenones Trididemnum cf. cyanophorum, Didemnidae, Ascid. from Bahama Lindquist 1988) diosphenols Ulosa sp., Halichon., Porif. Wratten 1978). [Pg.51]

Polyket branched C. rogiolenynes Laurencia microcladia of II Rogiolo, Ligurian Sea Ouella 1992). [Pg.53]

Polyket mixed biogenesis macrolides (pateamine A from Mycale sp., Poecil., Porif from NZ Northcote 1991) macrocyclic ethers y-pyrones (Phaceiocarpus sp., Gigartinales, Rhodoph. from SE Australia and Tasmania Murray 1995). [Pg.58]

Quinones anthraouinones Mar. Bact. Schumaker 1995,Echin. and other marine invertebr. Chang 1998 Land Liliaceae, Ang., especially in tropical and temperate/f/oe spp., and dimeric in Caesalpiniaceae, especially Cassia spp. from arid tropics AY Cassia spp. are cultivated in India and Egypt for danthron as a laxative phenanthropervleneouinones Mar. living-fossil and fossil crinoids, Echin. (likely polyket.) Land Hypericum, Theales, Ang. Pietra 1995). [Pg.78]

Bacteria overall > 410 Groom, 1992 Scarce diversification between land and sea. ALKAL. indole, phenazine, pyperazine, pyrrole, polypyrrole. PEPT. various classes, including siderophores. POLYKET. lactones, macrolides, quinones. CARBOH. (amino)glycoside, terpenoids hi hi ... [Pg.82]

Filicophyta (ferns) 10,000/0 doom. 1992 ISOPR. tritem. aammacerane and hooane. POLYKET. glycosidic. SHKIM. flavonoids and chromenes. high hi ... [Pg.83]

Cilioph. overall > POLYKET. bisanthrone pigments. high medium... [Pg.84]

Porif.> (hydro)pyrimidine, macroQ clic and oligomeric pyridine or pyridinium, naphthyridine, oxazole, pteridine, pyridoacridine, pyrrole, pyrroloimiiMquinone, (oxa)quinoli2idine, terpenoid indolizidine. ISOPR. Monotero. rare Sesouitem. . Ditero.. Sestertero. also degraded C>i Tritero.. POLYKET. macrolides, polyacetylenes, polycyclic (hydro)quinones, polyethers, (epidioxy)polyp ionates. ... [Pg.84]

Tritem. saualene-derived. POLYKET. polyiHr ionates. CARBOH. various metabolites high high... [Pg.85]

Antimicrobial/pathogens ofMamm. polyket. (polyacetylenes)/thiarubrine A and B Asteraceae, Ang., from S and E Africa, whose leaves are eaten by the chimpanzees MI... [Pg.115]

Defensive/arthropods and Vertebr. polyket. (benzoquinones and hydroquinones) African and eastern millepedes, Dipiopoda Demi 2000... [Pg.115]

Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...