L trimethylene

For the photodimerization of thymine, four isomeric products are assumed to be formed (Fig. 16). It is known that ds-syn and trans-syn isomers are formed by photolysis of l,l -trimethylene-bis-thymine, TpT, and denaturated DNA. The chemical shift of the 5-methyl proton at 1.12 to 1.18 ppm in our case suggests the formation of syn-type isomers. It has been found that when acetone is used as photosensitizer the products exhibit photodimer distribution similar to that obtained without using a sensitizer. 

Note that pH 11 was used for the purely chemical titration in Fig. 8 (A) in order to reach a sufficiently negative potential while in the electrochemical titration in fig. 8 (B) pH 9.5 was sufficient to extend the potential to -700 mV. Previously, Lozier and Butler had performed a redox titration ofthe PS-I reaction and obtained results very similar to those shown in Fig. 8 (A). These workers, using the Clostridial H/HV hydrogenase system as the reductant and l,l -trimethylene-2-2 -dipyridylium dibromide as the mediator, achieved specific potentials by gradually varying the pH between 8 and 10 to effect reduction ofthe photosystem-I electron acceptors. 

The tosylhydrazone of a-keto-1.l -trimethylene ferrocene failed to give any well-defined product on irradiation in the presence of sodium methoxide, while heating produced the starting ketone and the a-me-thoxy compound 16). 

In the course of an attempted titration of l,l -trimethylene-bis-(4-carbomethoxypyridinium) ion (++) with l-ethyl-4-carbomethoxy-pyridinyl radical ( )> we discovered that these species formed a strong complex, quite stable in acetonitrile at room tenq)erature. (Eq. 13). Epr spectra exhibited exchange narrowing and possibly two overlapping spectra, but the most significant property of the complex was a near infrared band 1360 nm (e g 1500)) which... 

N-(Tallow alkyl)-1,3-propanediamine. See Tallow propylene diamine N-Tallow alkyltrimethyleneamines, acetates. See Amine acetate N-Tallow all l trimethylene diamine. See Tallow propylene diamine N-(Tallow all l) trimethylenediamine, ethoxylated. See PEG tellow aminopropylamine... 

Polymethines with trimethylene bridges have been obtained by iateraction of the corresponding salts with 2,6-dimethoxy-l,4-dihydtobenzene (34) (74), for example, as follows, where Y = O, S, or Se. 

Bismuth ligands, 2,989-1061 bonding, 2,1030-1041 7i bonding, 2, 1033-1039 trigonal bipyramidal complexes, 2,1036 Bismuth line, 3,294 Bismuthotungstates, 3, 1042 Bismuth pentafluoride, 3, 292 Bismuth tribromide, 3, 291 Bismuth trichloride, 3, 290 Bismuth trifiuoride, 3, 290 Bismuth triiodide, 3,292 Bismuth trioxide, 3,284 2,2 -Bisphenol metal complexes color photography, 6,109 Bis(trimethylene)triamine metal complexes, 2, 49 4,4 -Bi-l, 2,4-triazolyl metal complexes, 2, 89 polymers... 

Poly(1,3-Trimethylene Carbonate) and Their Copolymers with D,L-Eactic Acid Ande-Caprolactone.230... 

POLYd, 3-TRIMETHYLENE CARBONATE) AND THEIR COPOLYMERS WITH d,l-LACTIC acid ANDE-CAPROLACTONE... 

SCHEME 8.8 Synthesis of statistical poly(trimethylene carbonate-co-D,L-lactide) copolymers. 

Pego AP, Siebum SB, Luyn MJAV, et al. Preparation of degradable porous structures based on 1,3-trimethylene carbonate and D,L-lactide(co)polymers for heart tissue engineering. Tissue Eng, 2003, 9, 981 994. 

Pego AP, Luyn MJAV, Brouwer LA, et al. In vivo behaviour of poly (1,3-trimethylene carbonate) and copolymers of 1,3-trimethylene carbonate with D,L-lactide or e-caprolactone Degradation and tissue response. J Biomed Mater Res, 2003, 67A, 1044—1054. 

Storey RF and Hickey TP. Degradable polyurethane networks based on D,L-lacdde, glycohde, e-caprolactone, and trimethylene carbonate homopolyester and copolyester triols. Polymer, 1994, 35, 830-838. 

Trimethylene dibromide (i mol) condenses with ethyl malonate (1 mol) in the presence of sodium ethoxide (2 mols) to form ethyl cyctobutane-l 1-diesrboxylate (I). Upon hydrolysis of the latter with alcoholic potassium hydroxide, followed by acidification cyclobutane-l 1-dicarboxyUc acid (II) is obtained. 

Chan and Li reported that conjugated 1,3-butadienes were produced in moderate yields when carbonyl compounds reacted with 1,3-dichloropropene and zinc in water (Eq. 8.29).61 The use of 3-iodo-1-chloropropene instead of 1,3-dichloropropene greatly improved the yields. When the reactions were interrupted after their initial allyla-tions, subsequent base treatment of the intermediate compounds produced vinyloxiranes in high yields. Similarly, reactions of carbonyl compounds with 3-iodo-2-chloromethyl-l-propene followed by base treatment produced 2-methylenetetrahydrofurans (Eq. 8.30).62 Thus, the 3-iodo-2-chloromethyl-l-propene served as a novel trimethylene-methane equivalent.63... 

Ci2H20O4S2 5-Deoxy-3-C-formyl-1,2-O-isopropylidene- -L-lyxofuranose 31-(trimethylene dithioacetal) DFPLXT10 34 32 358 366... 

---