PDC.

The most frequently used bit types are the roller cone or rock bit (F g. 3.8) and the polycrystalline diamond cutter or PDC bit. 

Acyl halides are intermediates of the carbonylations of alkenes and organic-halides. Decarbonylation of acyl halides as a reversible process of the carbo-nylation is possible with Pd catalyst. The decarbonylation of aliphatic acid chlorides proceeds with Pd(0) catalyst, such as Pd on carbon or PdC, at around 200 °C[109,753]. The product is a mixture of isomeric internal alkenes. For example, when decanoyl chloride is heated with PdCF at 200 C in a distillation flask, rapid evolution of CO and HCl stops after I h, during which time a mixture of nonene isomers was distilled off in a high yield. The decarbonylation of phenylpropionyl chloride (883) affords styrene (53%). In addition, l,5-diphenyl-l-penten-3-one (884) is obtained as a byproduct (10%). formed by the insertion of styrene into the acyl chloride. Formation of the latter supports the formation of acylpalladium species as an intermediate of the decarbonylation. Decarbonylation of the benzoyl chloride 885 can be carried out in good yields at 360 with Pd on carbon as a catalyst, yielding the aryl chloride 886[754]. 

Propargylic alcohol, after lithiation, reacts with CO2 to generate the lithium carbonate 243, which undergoes oxypalladation. The reaction of allyl chloride yields the cyclic carbonate 244 and PdC. By this reaction hydroxy and allyl groups are introduced into the triple bond to give the o-allyl ketone 245[129]. Also the formation of 248 from the keto alkyne 246 with CO2 via in situ formation of the carbonate 247 is catalyzed by Pd(0)[130]. 

PCC IS pyridinium chlorochromate PDC is pyridinium dichromate Both are used in dichloromethane ... 

Oxidation of primary alcohols to aide hydes (Section 15 10) Pyridinium di chromate (PDC) or pyridinium chloro chromate (PCC) in anhydrous media such as dichloromethane oxidizes primary al cohols to aldehydes while avoiding over oxidation to carboxylic acids... 

Oxidation of secondary alcohols to ke tones (Section 15 10) Many oxidizing agents are available for converting sec ondary alcohols to ketones PDC or PCC may be used as well as other Cr(VI) based agents such as chromic acid or po tassium dichromate and sulfuric acid... 

Aldehydes are more easily oxidized than alcohols which is why special reagents such as PCC and PDC (Section 15 10) have been developed for oxidizing primary alco hols to aldehydes and no further PCC and PDC are effective because they are sources of Cr(VI) but are used m nonaqueous media (dichloromethane) By keeping water out of the reaction mixture the aldehyde is not converted to its hydrate which is the nec essary intermediate that leads to the carboxylic acid... 

PDC (Section 15 10) Abbreviation for pyndinium dichromate (C5H5NH)2 Cr207 Used in same manner and for same purposes as PCC (see preceding entry) n Pentane (Section 2 10) The common name for pentane CH3CH2CH2CH2CH3... 

Redox doping Red oxide Redox indicators Redox polymers REDOX process Redox reactions Red PDC [80-22-8]... 

Rotary compressors are also PDC types, but where refrigerant flow rotates during compression. Unhke the reciprocating type, rotaiy compressors have a built-in volume ratio which is defined as volume in cavity when the suc tion port is closed (V = m vj over the volume in the cavity when the discharge port is uncovered (V = m vj). Built-in volume ratio determines for a given refrigerant and conditions the pressure ratio which is ... 

F3TK Mixer for feed and recycle PDC Product D to compressor... 

Visit http //msds.pdc.comell.edu/msdssrch.asp. This site, operated by Cornell University, has a searchable database of MSDS files. 

---