2,2 -Ethylidene-bis

CN [l-Hydroxy-2-(3-pyridinyl)ethylidene]bis-[phosphonic acid] monosodium salt acid... 

L-tryptophan is a naturally-produced, natural amino acid used as a dietary supplement. Samples from one manufacturer were found to be contaminated by trace amounts of another naturally occurring compound — l,l -ethylidene bis-[i.-tryptophan]. The latter compound appears to have been responsible for causing a number of deaths and additional cases of chronic eosinophilia-myalgia,111 some of which might have been prevented had there... 

The concept of using group I metal initiators was applied in order to minimize the toxicity generated by heavy metal residues in the end product PLAs when using metals like aluminum, tin, and lanthanides as initiators. In recent years, dinuclear lithium and macro-aggregates with phenolate ligands have attracted substantial interest, mainly due to uncommon strucmral feamres and their ability to catalyze formation of polyester and various other polymeric materials via ROP [28]. A series of lithium complexes supported with 2, 2-ethylidene-bis (4, 6-di-tert-butylphenol) (EDBP-H2) 2-6, (Scheme 6) are excellent initiators for the ROP of L-lactide in CH2CI2 at 0 °C and 25 °C [33-35]. In this case, the PDIs of the obtained PLAs were quite narrow (1.04—1.14) and a Unear relationship between and the monomer-to-initiator ratio ([M]o/[I]o) existed at 0 °C. Dimeric complexes 4 and 6 were the... 

Chemical Name Phosphonic acid, (l-hydroxy-2-(lH-imidazol-l-yl) ethylidene)bis-... 

SYNS BIFORMYCHLORAZIN BIFORMYLCHLO-RAZIN N,N -BIS(l-FORMAMIDO-2,2,2-TRICHLORO-ETHA L)PIPERAZINE l,4-BIS(l-FORMAMIDO-2,2,2-TRICHLOROETHYL)PIPERAZINE CA 70203 CELA 50 CELA W 524 CME 74770 COMPOUND W CW 524 FORMAAnDE,NJ4 -(l,4-PIPERAZINEDIYLBIS-(2,2,2-TRICHLOROETHYLIDENE))BIS-(8CI,9CI) FUNG-INEX N3SI -(PIPERAZINEDIYLBIS(2,2,2-TRICHL0R0-ETHYLIDENE)) BIS(FORMAMIDE) SAPROL W 524... 

Ru203C,5H,2, Ruthenium, p-carbonyl-p.-ethylidene-bis[carbonyl(it -cydopen-tadienyl)-, 25 183... 

BDAF. See 4,4 -((2,2,2-trifhioro-l-(trifluoro-methyl)ethylidene)bis(4,1 -phenyleneox-y))bisbenzenamine. 

Kurihara, N., Yanagisawa, H., Jin, Z., and Wada, O., Production of polyclonal antibodies against l,l -ethyliden bis[L-tryptophan] (EBT), a potential contaminant causing eosinophilia-myalgia syndrome (EMS), Toxicol. Lett., 66,231,1993. 

Zangrilli, J. G., Mayeno, A. N., Vining, V., and Varga, J., l,l -Ethylidene-bis[L-tryptophan], an impurity in L-tryptophan associated with eosinophilia-myalgia syndrome, stimulates type I collagen gene expression in human fibroblasts in vitro, Biochem. Mol. Biol, bit., 37, 925, 1995. 

The C-methyl derivatives (350) and (351) have been synthesized by hydrolysis and thiolysis of ethylidene bis(dibromoarsine) (349) (Equation (53)). The adamantane (350) was also synthesized simply by heating potassium arsenite with propionic acid in propionic anhydride <69ZAAC(370)3l>. The tetra-A-ethyl compound (352) was obtained from (349 Hal = Cl) by the same method as described for the synthesis of (348). 

Ethylidene bis(4,6-di-t-butylphenol), 2,2 -Ethylidenebis(4,6-di-t-butylphenol)i EINECS 252-816-3 Phenol, 2,2 -ethylidenebis(4,6-bis(1,1-dimethyl-ethyl)- Vanox 1290, Antioxidant oxidative inhibitor for polymers process stabilizer for polyolefins stabilizer for PU and PS, Crystals mp 162-164°, Vanderbilt R.T. Co. Inc. 

The chemistry of these polymers is based on the dianhydride of 4,4 -[2,2,2-trifluoro( 1 -trifluoromethyl)ethylidene]bis(l,2-benzenedicarboxylic acid) 5 (6FDA) that is reacted with ODA 2 to produce polyimide 8 (Du Pont NR 150 A2 ). The other polymers in this series are copolyimide NR 150 B2 composed of repeating units 8, 9 and 10 obtained by reacting dianhydride 5, with ODA 2, 1,3-benzenediamine 6 (mefa-phenylenediamine, MPDA) and 1,4-benzenediamine 7... 

Figure 9 Synthesis of fluorinated polyimides marketed by Du Pont. NR 150 A2 is polyimide 8 prepared from 4,4 -[2,2,2-trifluoro(l-trifluoromethyl)ethylidene]bis(l,2-benzenedicarboxylic acid) dianhydride (6FDA) 5 and ODA 2. NR 150 B2 is a copolyimide synthesised by reacting dianhydride 5 with diamines 2, 6 and 7.

An example of thermoplastic fluorinated polyimide adhesives is provided in Fig. 36. The first step is the reaction of 4,4 -[2,2,2-trifluoro(l-trifluoromethyl) ethylidene]bis(l,2-benzenedicarboxylic acid) dianhydride with either 4,4 -[[2,2,2-trifluoro-l-(trifluoromethyl)ethylidene]bis(4,l-phenyleneoxy)]bisbenzeneamine or 4,4 -[(l-methylethylidene]bis(4,l-phenyleneoxy)]bisbenzeneamine yielding the corresponding polyamic acids. Chemical dehydrocyclisation with trifiuoro-acetic anhydride and triethylamine provides the poly(ether-isoimides) 52 and 54 with 0.40 and 0.45 dl g , respectively, whereas acetic anhydride and pyridine gave polyimides 53 and 55 with tiji 0.75 and 0.71 dl g respectively [89]. 

TMDA52,3,5,6-tetramethyl phenylene diamine 6FDA55,5"-(l,l,l-trifluoromethyl)ethylidene)bis-l,3 isobenzoftirandione PP05poly(2,6-dimethyl-l,4-phenylene oxide) temperature 25 °C for PTMSP and poly(4-methyl-l-pentyne) other polymers at 35 °C... 

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