DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reagents Ia and Ib were prepared according to the following equations: ##STR1## The product of equation 4, a 2-chloro-3-[[2-(dimethylamino)ethyl]amino]-1,4-naphthoquinone, II; was formed by adding 8.
8 g of N, N-dimethylethylenediamine to a suspension of 22.
7 g of 2, 3-dichloro-1,4-naphthoquinone in 200 ml of ethanol.
The reaction mixture was stirred at room temperature overnight and then refluxed for 1 h.
After cooling, a bright red precipitate was collected by filtration to give .
about.
30 g (95% yield) of the crude HCl salt of II.
The free base of II was then prepared by treating the crude product with excess aqueous Na.
sub.
2 CO.
sub.
3, followed by extraction into CH.
sub.
2 Cl.
sub.
2 and removal of the solvent under vacuum to yield II.
Reagent Ib was prepared as illustrated by equation 5 by stirring 1 g of II in 5 ml of BrCH.
sub.
2 CH.
sub.
2 CH.
sub.
2 Si(OCH.
sub.
3).
sub.
3 [prepared by reacting HC(OCH.
sub.
3).
sub.
3 with 1-bromo-3-(trichlorosilyl)propane purchased from Petrarch Chemical Co.
] at 90.
degree.
C.
for 12 h, after which time the product precipitated from solution.
Filtration and repeated washings with hexane followed by drying under vacuum yielded 1.
6 g (.
about.
90%) of Ib.
Ia was prepared in a manner analogous to Ib by stirring II with excess n-PrBr at 70.
degree.
C.
until the product precipitated.
The [.
sup.
1 H] NMR (270 MHz, CD.
sub.
3 OD) for Ib showed resonances at delta 0.
55 (t, 2H silyl methylene, J=8 Hz); 1.
78 (m, 2H, alkyl methylene); 3.
13 (s, 6H, N.
sup.
+ -methyl); 3.
33 (m, 2H, N.
sup.
+ -methylene); 3.
43 (s, 9H, silyl methoxy); 3.
56 (t, 2H, N.
sup.
+ -methylene, J=6.
8 Hz); 4.
12 (t, 2H, N-methylene); 7.
61 (m, 2H, aryl); 7.
90 (d, 2H, aryl).
Elemental analysis (Galbraith) for Ib was satisfactory.
Calculated for C.
sub.
20 H.
sub.
30 N.
sub.
2 O.
sub.
5 ClSiBr: C, 46.
02; H, 5.
79; N, 5.
37; Cl, 6.
79; Si, 5.
38.
Found: C, 46.
2; H, 5.
84; N.
5.
31; Cl, 6.
92; Si, 5.
50.
Reagent Ib was then used to derivatize the high surface area oxides and electrodes.
Platinum wire (0
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Molecular Biology 
