7-ACMA

These procedures, as well as being applicable to cephalosporins and penicillins, proved viable with cephamycin C and provide a practical route to 7-ACMA. Reaction of protected cephamycin 467 with oxalyl chloride and anhydrous sodium carbonate (dioxane) followed by aqueous treatment, afforded 37% oxamic acid (469), 34% dioxamic acid (470), and protected a-aminoadipic acid (471) (85%). Further quantities of the desired product were obtained by acid hydrolysis of 470 to 469 in 87% yield. An interesting result of hydrolysis of each oxazolidinedione moiety in putative intermediate 468 is the formation of a different functional group in 469. Deacylation with diphenylcarbodiimide (CH2CI2) converted 469 to 7-ACMA benzhydryl ester 472 (56%) and trione 473. The stereointegrity of both chiral centers and the olefin position were verified by transformation of methoxyamine 472 to cefoxitin by standard means. The same sequence could also be performed without isolation of delicate 472. 

Acylation of 7-ACMA (derivatives) is considerably more difficult than analogous transformations in the nonmethoxylated series. This is primarily because of a reduced nucleophilicity of the amine component, engendered by an inductive effect of the 7a-methoxy substituent. In addition, 7a-methoxyamines are much less stable than their nonmethoxylated analogs and are also more sterically hindered. In general, the method of choice for acylation of 7-ACMA derivatives involves treatment... 

Figure S-16. Schematic reaction coordinate diagrams of a reaction series, showing ACj, the intrinsic barrier, and ACma, the maximum standard free energy difference.

GEAR HOUSING V-BELT/GEAR.MAT L. OF CONST. ACMA GEAR CLASS-... 

C. Sentorun, H. Haykiri-Acma, S. Kucukbayrak, Thermochim. Acta Til (1996) 65. 

H. Haykiri-Acma, A. Ersoy-Meticboyu and S. Kucukbayrak, Energ. Convers. Manage., 42... 

For professionals involved with the composites indus-try. Las Vegas is the place to be this month. The COMPOSITES 2012 Exhibition and Convention, which is produced by the American Composites Manufacturers Association (ACMA), will be held February 21-23 at the Mandalay Bay Hotel in Las Vegas. More than 3,000 attendees from a variety of market segments are expected to attend. Markets represented at the show will include aerospace, architectural, automotive, civil structure, construction, corrosion, energy, kitchen and bath, marine, mass transportation, military, sports and leisure, and truck/RV. 

The Adhesive and Sealant Council (ASC) will again be partnering with ACMA to provide the 600-sq-ft Adhesive and Sealant Pavilion at this year s event. The Pavilion will be prominently displayed on the show floor and will accommodate five exhibitors from the adhesives and sealants sector. Exhibitors will include raw materials suppliers and manufacturers of adhesive and sealant solutions for the composites market. 

Motavalli, M. and C. Czaderski (2007). FRP composites for retrofitting of existing civil structures in Europe State-of-the-art review. ACMA, Tampa, FL, 17-19 October, 2007. 

ACMA American Composite Manufacturers Association (ACMA) 1010 North Glebe Road, Suite 450 Arlington VA, United States Telephone (703) 525-0511 Fax (703) 525-0743 E-mail info acmanet.org Internet http //www.acmanet.org/... 

In 2007, ACMA (American Composites Manufacturers Association) and ASCE (American Society of Civil Engineers) jointly developed an LRFD (Load Resistance Factor Design) standard for pultruded composites. LRFD refers to a design methodology that makes use of load and resistance factors based on the known variability of applied loads and material parameters. The development of the LRFD standard is expected to significantly influence the universal acceptance of pultruded composites (Busel, 2008). 

American Composites Manufacturers Association (ACMA) - http // www.mdacomposites.org/ mda... 

Ulrich C, Petersson H, Sundgren H, Bjdrefors F, Krantz-Riilker C (2007) Simultaneous estimation of soot and diesel contamination in engine oil using electrochemical impedance spectroscopy. Sens Acma-torsB 127 613-618. doi 10.1016/j.snb.2007.05.014... 

Wood poles typically require treatment with preservatives [e.g., creosote, copper chromium arsenate (CCA), penta-chloro-phenol (Penta)] to resist rot, decay, etc., in order to yield a service life of about 30-35 years. Due to preservation treatments of wood poles [22] which are hazardous to humans, the US-EPA regulations have led to evaluating the viability of alternatives to treated wood poles, i.e., steel, concrete, and FRP composite. Recently, through a strong push from the American Composites Manufacturers Association (ACMA), FRP composite poles have been receiving greater attention from electrical utility and telecommunication companies due to their inherent advantages over poles made of conventional materials. 

Busto, N. Garcia, B. Leal, J. M. Secco, R Venturini, M. The mode of binding ACMA-DNA relies on the base-pair nature. Org. Biomol. Chem. 2012,10,2594-2602. 

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