I BPh

Fig. 13.—Reciprocal of the average degree of polymerization Xn plotted against the rate of polymerization Rp at 60°C for undiluted methyl methacrylate using azo-bis-isobutyro-nitrile (Azo), benzoyl peroxide (BZ2O2), cumene hydroperoxide (CHP), and i-butyl hydroperoxide (i-BPH). (Baysal and...

A-Alkylpyridinium salts 20 with alkyl chains from 14 to 22 carbon atoms andp substituents such as methyl, phenyl, and styryl groups (stilbazolium salts) with Cl", Br", I", BPh ", and C H SOj" counteranions were prepared by Ster et al. [27]. The stability of the SmA phase increased with the size of the anion, but no mesophase was observed with heptyl sulfonate. 

CoCl(PPh3)3], Reaction of [Co(TIMEN )]Cl 9 with oxygen in the presence of NaBPh leads to the formation of the peroxo-complex [Co(r -02)(TIMEN 5 )] BPh 10, which is a rare example of a side-on r -peroxo cobalt complex (the majority of Co-O -adducts are rj -O -complexes, i.e. end-on). The authors also showed that 10 is capable of converting molecular oxygen to benzoylchloride. 

The structure of a copper(I) complex [Cu(L)][BPh4] (trigonal pyramidal three pyridyl groups in the trigonal plane and tertiary amine at the apex ligand as that in complex (4)) was also determined.29 The structure of complex [Cu2(L)(MeCN)2][BF4]2 (ligand as that in complex (179))169 and complex [Cu(L)][BPh]4 (ligand as that in complex (220)) 09 were also reported. 

RhHI 3 (L=P(i-Pr)3) is capable of forming the water adduct (21). The water addition to RhHL3 takes place in pyridine readily at room temperature to give an ionic product [RhH2(py)2L2]0H (eq. 17), which can be isolated as its BPh salt (v(Rh-H) 2076, 2112... 

The intermediary acceptor I is thought to be a complex involving a BPh and one of the monomeric BChls (18,30-34) This view is based on the observation that the reduction of I causes absorption changes in regions of the spectrum attributable to BPh and also in regions normally ascribed to BChl It has been proposed from nanosecond studies on reaction centers having Q reduced that P" is a thermal mixture of P BPh and P BChl , with about 60% of the added electron density on the BPh at room temperature (33) Our recent kinetic measurements (22) and low-temperature picosecond photodichroism stu-... 

The fates of the radical ion pairs produced upon electron transfer depends on the nature of their production. As already mentioned, the Bp DMA" com formed from irradiation of the ground-state CT complex. Bp - DMA, is suggested by Mataga and co-workers [24] to decay only by febet, on a timescale of 85 ps. Diffusional separation to solvent separated radical ion pairs or proton transfer within Bp -DMA com are not kinetically competitive. The triplet CRIP Bp -I- DMA" ip has two decay pathways that occur on the picosecond timescale. The first process is proton transfer, fept, to generate a triplet radical pair, BpH-l- DMA ] (Scheme 2.3). In acetonitrile, this occurs with a rate constant of fept of 1.3 x 10 s [43]. The second process leading to the decay of the CRIP is diffusional separation to the SSRIP, kips, which occurs with a rate constant of 5 x 10 s (Scheme 2.3) [43]. Thus the efficiency of the... 

Saw palmetto is most often promoted for the treatment of benign prostatic hyperplasia (BPH). Enzymatic conversion of testosterone to dihydrotestosterone (DHT) by 5a-reductase is inhibited by saw palmetto in vitro. Specifically, saw palmetto shows a noncompetitive inhibition of both isoforms (I and II) of this enzyme, thereby reducing DHT production. 

N.A. Sitosterol, tannins, saponins, tribulusamide A and B, n -1 mn.v-fcru loy 1 tyram i nc, terrestriamide, n -1 runs-a mm aroy Ityram i nc.174 Estrogenic properties, antiandrogenic action, reduce benign prostate hyperlasia (BPH). 

The tetraamide [U Fc(NSiBu Me2)2 2] was prepared from the potassium salt of 1,1 -ferrocenylenediamine Fc N(H)SiBu Me2 2 and Ufdthf). Its oxidation by I2 followed by treatment with NaBPh4 produced the mixed-valence (Fe /Fe ") compound [U Fc-(. SiBLi. le2)2 f2l[BPh ], in which the centre mediates the electronic communication. The model of electron transfer between Fe and I- e " via a direct U-Fe interaction was confirmed by magnetic measurements, EPR, NIR and IR spectroscopy and DFT calculations on model systems. ... 

Caution [C, ] CrCl <30 Contra Component sensitivity, asthma, severe COPD, sinus bradycardia Disp Soln SE Irritation, bitter taste, superficial keratitis, ocular allergic Rxn EMS Drug is absorbed systemically OD May cause electrolyte disturbances (K), acidosis and bradycardia monitor ECG Doxazosin (Cardura, Cardura XL) [Antihypertensive/Alpha Blocker] Uses HTN symptomatic BPH Action < [-Adrenergic blocker relaxes bladder neck smooth muscle Dose HTN Initial 1 mg/d PO may be T to 16 mg/d PO BPH Initial 1 mg/d PO, may T to 8 mg/d XR 2-8mg qAM Caution [B, ] Use w/ PDE5 inhibitor (eg, sildenafil) can cause 1 BP Contra Component sensitivity Disp Tabs SE Dizziness, HA, drowsiness, sexual dysfxn, doses >4 mg T postural BP risk Interactions T Effects W/ nitrates, antihypertensives, EtOH i effects W/ NSAEDs, butcher s broom -t effects OF clonidine EMS Concurrent EtOH use can T drowsiness syncope may occur w/in 90 min of initial dose OD May cause profound hypotension place pt in supine position, give IV fluids, use pressors if needed... 

Fig. 19.20 Stereoview of the phctosynthetic reaction center. The photoexched electron is transferred from the special pair to another molecule of bactenochlorophyll (BCI), then to a molecule of hacteriopheophytin (BPh), then to a bound quinone (Q), ell in a period of 250 ps. From the quinone it passes through the nonheme iron (Fe) to an unbound quinone (rot shown) in a period of about 100 i. The electron is restored to the "hole" in the special pair via the chain oF hemes I He I, etc.) in four cytochrome molecules, also extremely rapidly (—270 ps). The special pair here is rotated 90° with respect to Fig. 19.19 [From Deisenhofer, J. Michel, H.. Huber. R. Trends Bioihem. Sci. 1985. 243-248. Reproduced wiih permission.)...

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