In case of multicomponent single pot strategy, one equivalent of aromatic aldehyde and two equivalents of barbituric/thiobarbituric acid was stirred in dry ethanol and catalytic amount of sodium ethoxide
was added and the reaction mixture was refluxed for 4-6h which yielded the desired tricyclic heterocyclic compounds in good yields.
[x.sub.1], [x.sub.2] and [x.sub.3] are independent variables and correspond to the percentage of NaOH, KOH and sodium methoxide or sodium ethoxide
in the mixture, respectively;
The transesterification were enhanced by the use of potassium hydroxide, sodium hydroxide, sodium methoxide or sodium ethoxide
as catalysts [5-7].
Semi-thick sections (2 [micro]m) were placed in 7-mm wells of a Teflon-coated spot slide (Erie Scientific), deplasticized in a 1:5 v/v solution of mature sodium ethoxide
in anhydrous ethanol, and subsequently washed in three changes of anhydrous ethanol.
He has developed an approach that involves mixing concentrated hydrochloric acid with titanium ethoxide
, ethanol, and Pluronic[R] P123 (a block copolymer surfactant manufactured by BASF) to create a mesoporous titania film (the "meso-" prefix refers to pores of 2-50 nanometers in diameter).
Albemarle has introduced Diethylaluminum Ethoxide
, which will be used primarily as a catalyst component in Ziegler-Natta type systems for olefin polymerization.
PREPARATION OF SODIUM ETHOXIDE
IN ETHANOL (0.5 MOL/L)
About 37.54 mL of absolute ethanol was added dropwise to 12.46 mL of ice cold titanium tetrachloride solution in conical flask with vigorous stirring to form titanium ethoxide
. An appropriate amount of ice cold ethanol/water mixture was then added to the titanium ethoxide
dropwise with stirring to give a final concentration of [Ti.sup.+4] 0.322 M.
Oil (600 mg), freshly prepared sodium methoxide or ethoxide
(2 g each) and n-hexane (30 ml) were taken in a flask and refluxed in modified microwave oven fitted with a reflux condenser (Dawlance, Model: DW-131HP, rated output microwave = 900 watt, microwave frequency = 2450 MHz) for 5 minutes with 1 minute intervals.
The crude [beta]-ketoester 6 (2.78 g, 0.01 mol) was added to a boiling solution of sodium ethoxide
(prepared from 4.9 g of Na in 100 mL of absolute EtOH) containing thiourea (11.42 g, 0.15 mol).
To the stirred solution of sodium ethoxide
(13.6 g, 0.2 mol), a mixture of cyclohexanone (1, 19.6 g, 0.2 mol) and diethyl oxalate (29.2 g, 0.2 mol) was added drop wise below 5-10[degrees]C.
The hydrolysates were prepared using titanium(IV) ethoxide
(TIEO; Sigma Aldrich), titanium(IV) propoxide (TIPO; Sigma Aldrich) as well as iso-propanol (iPrOH; POCH SA), and acetylacetone (AcAc; Sigma Aldrich) in the following volume ratio: