Hellings

Schrader M, Bahimann K and Hell S W 1997 Three-photon-excitation microscopy Theory, experiment, and applications Optik 104 116-24... [Pg.1674]

Hell S W and Kroug M 1995 Ground-state-depletion fluorescence microscopy a concept for breaking the diffraction resolution limit Appl. Phys. B 60 495-7... [Pg.1674]

Hell S W and Nagorni M 1998 4Pi confocal microscopy with alternate interference Opt. Lett. 23 1567-9... [Pg.2505]

Klar T A and Hell S W 1999 Subdiffraction resolution in far-field fluorescence microscopy Opt. Lett. 24 954-6... [Pg.2505]

Li H, R Helling, C Tang and N Wingreen 1996. Emergence of Preferred Structures in a Simple Model of Protein Folding. Science 273 666-669. [Pg.576]

The conversion of an aliphatic carboxylic acid into the a-bromo- (or a-chloro ) acid by treatment with bromine (or chlorine) in the presence of a catal3rtic amount of phosphorus tribromide (or trichloride) or of red phosphorus is known as the Hell-Volhard-Zelinsky reaction. The procedure probably involves the intermediate formation of the acyl halide, since it is known that halogens react more rapidly with acyl haUdes than with the acids themselves ... [Pg.427]

Haworth reaction Hell-Volhard-Zelinsky reaction Hoesch reaction Hofmaim reaction. ... [Pg.1210]

All of the pieces pictured here are not going to fit perfectiy into each other and that s going to cause all sorts of leaks. The answer is teflon tape. Strike loves teflon tape This inexpensive product is found in the plumbing department of any hardware store and is the duct tape of the next century. Teflon tape is chemically and thermally indestructible. This stuff is wrapped around any piece of pipe or joint, said part then jammed into its appropriate receptacle and the tape will mold to form a perfect fit. Hell, it can mummify a whoie joint compiex to make it absolutely impregnable. [Pg.20]

TETRAMETHOXYALLYLBENZENE In varying amounts in some parsley oils (hell, just throw parsley oil in a pot to get a grab bag of psychedelic amphetamines ). [Pg.49]

Yeesh What the hell did all that mean Well, let s see what Sunlight s preliminary interpretations are as were secreted to Strike via encrypted messages. It is interestingly voyeuristic to see the first machinations of a recipe come to life ... [Pg.77]

METHOD 6 This one is for meth cooks only as it is only practical for making P2P, not MD-P2P because Strike don t know where one can get piperonylic acid . It has been around awhile and works really well [20]. Therefore the chemicals needed have been restricted for quite some time. But if one can get them then what the hell. [Pg.93]

As you are about to see, the standard methods for using the NaBH(OAc)3 catalyst call for it to be in a dried, powder form. Strike supposes the benzene in the above reaction can be distilled off to leave dry catalyst. But don t quote Strike on that Maybe it could be made in situ in the DCE solvent of the reaction to come (don t ask). Aw hell Just go and buy the shit ... [Pg.121]

Right about now the chemist is probably screaming, "Hey, where the hell is my big yield of you-know-what ". Sorry. Charlie. This way of aminating is easy but chemically it s a crap shoot with yields anywhere from 10-50%. The theoretical odds are against the reaction but if it is done as outlined here, the chances of success are better. Actually, Strike thinks the yields could be higher because half the problem was probably caused by low bromosa-frole yield which we have hopefully corrected in the preceding section ... [Pg.158]

Strike found this next thing doing an all-nighter Chemical Abstracts search. Strike does not even want to try to explain it. Just read it. If you understand it, great If not, don t sweat it. Hell if Strike will ever try the damn thing [88] (Note the P2Pol production) ... [Pg.188]

This method of a bromination of carboxylic acids is called the Hell-Volhard-Zelinsky reaction This reaction is sometimes carried out by using a small amount of phosphorus instead of phosphorus trichloride Phosphorus reacts with bromine to yield phosphorus tribromide as the active catalyst under these conditions... [Pg.816]

The Hell-Volhard-Zehnsky reaction is of synthetic value m that the a halogen can be displaced by nucleophilic substitution... [Pg.816]

Section 19 16 Halogenation at the a carbon atom of carboxylic acids can be accom plished by the Hell-Volhard-Zehnsky reaction An acid is treated with chlorine or bromine m the presence of a catalytic quantity of phospho rus or a phosphorus trihalide... [Pg.823]

Nucleophilic substitution by ammonia on a halo acids (Section 19 16) The a halo acids obtained by halogenation of car boxylic acids under conditions of the Hell-Volhard-Zelinsky reaction are reac tive substrates in nucleophilic substitu tion processes A standard method for the preparation of a ammo acids is dis placement of halide from a halo acids by nucleophilic substitution using excess aqueous ammonia... [Pg.928]

The a halo acid is normally prepared by the Hell-Volhard-Zehnsky reaction (see Sec tion 19 16)... [Pg.1121]

Hell-Volhard-Zelmsky reaction (Section 19 16) The phos phorus tnhahde catalyzed a halogenation of a carboxylic acid... [Pg.1285]

Storage and Handling of S hell JAeodol Detergent Alcohols, Ethoyylates, andEthoyysulfates, SC 133—179, SheH Chemical Company, Houston, Tex., 1979. [Pg.450]

C. S. Helling and J. Dragun, in Test Protocolsfor Environmental Fate andMovement of Toxicants, Proc. Symp. Assoc. Off. Anal. Chemists, 94th Ann. [Pg.60]

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