Potassium hydride, with

Ultrasound also promotes the reaction of potassium hydride with some silicon hydrides to give silyl anions in excellent yields and... 

These ate complexes are prepared by reaction of potassium hydride with a 9-alkyl-9-borabicyclo[3.3. l]nonane (9-R-9-BBN). 

Also, potassium borohydride can be made by reacting potassium hydride with methyl borate at high temperature ... 

The base employed by Brown and Yamashita was the potassium salt of 1,3-diaminopropane, prepared by reaction of potassium hydride with the solvent of the reaction, 1,3-diaminopropane. The reagent is very effective, and yields of isomerically pure products are high, but potassium hydride is hazardous, expensive and difficult to handle. 

Reaction of sodium or potassium hydride with a hydrogen-bearing silane (equation 2) ... 

Alkylation of alcohols with 2-(methoxyethoxy)methyl chloride (MEMC1, bp 50-52 C/1.7 kPa) (HAZARD carcinogenic) under an assortment of conditions pioneered by Corey still retain favour. These include reaction of the lithium or sodium alkoxide (generated from sodium or potassium hydride) with ME MCI in THF or DME at 0 °C (10-60 min) and reaction of the alcohol with MEMCI in dichloromethane in the presence of /-Pr NEt at room temperature for 3 h. For hindered alcohols, sodium iodide can be added to generate the more reactive 2-methoxyethoxymethyl iodide in situ. Alternatively, reaction of the alcohol with [(2-methoxyethoxy)methyl]triethylammonium chloride (prepared from MEMO and trie thy lamine) in refluxing acetonitrile is recommended for acid-sensitive substrates such as tertiary alcohols [Scheme 4,271],500... 

Hindered tertiary alcohols also react vigorously with potassium hydride with quantitative liberation of hydrogen. 

Potassium triisopropoxyborohydride, a mild selective reducing agent, rapidly converted ketones and aldehydes to the corresponding alcohols, while many common functional groups were inert.The reaction of potassium hydride with triphenylborane produced the triphenylborohydride, which is highly hindered and which exhibited excellent chemoselectivity between ketones. Cyclohexanone was reduced in preference to cyclopentanone (97 3) and 4-heptanone (99.4 0.6), while methyl ketones were more reactive than 4-heptanone (2-heptanone, 94 6 acetophenone, 97.8 2.2). 

This base is formed quantitatively by reaetion of potassium hydride with excess 3-aminopropylamine (trimethylenediamine). The base is fairly soluble in the amine (>1.5 M) the solutions are stable at room temperature for at least 8 hr. 

The anions [H3M4(CO)i2] (M = Ru, Os) and [H2M4(CO)i2] have been prepared by the use of either ethanolic/KOH or potassium hydride in tetrahydrofuran (187, 188). The related reaction using potassium hydride with H2Ru4(CO)i3 leads to CO displacement and the production of the salt K2[H2Ru4(CO)i2]. 

Brown et al [8] have devised a general, convenient, and simple synthesis of straight-chain alcohols from internal alkynes. Long-chain internal alkynes, prepared by Eiters procedure [9] by metalating 1-alkynes, followed by treatment with alkyl halides, are isomerized to 1-alkynes on treatment with potassium-3-aminopropylamide (KAPA) [10] in 1,3-diaminopropane (APA). KAPA is prepared by the quantitative reaction of potassium hydride with excess of (APA) [10]. This difunctional superbase produces exceptionally rapid migration of internal C=C to the terminal C=C position. The terminal alkynes thus obtained are subjected to dihydroboration with 2 equiv of 9-BBN. The dibora intermediate on alkaline hydrogen peroxide oxidation provides 61-80% yield (Table 6.4) [8] of the corresponding alcohols (Eq. 6.2). 

Alkali metal trialkylborohydrides are attractive reducing agents in addition to other numerous synthetic applications [1], Brown and coworkers [2] have also synthesized alkali metal di- and monoalkylborohydrides. Consequently, the reaction of lithium, sodium, and potassium hydrides with 9-BBN, ChXjBH, Sia BH, IPCjBH, ThxBHj, and IPCBHj afford the corresponding hydrides, which are examined with respect to rate, stoichiometry, and products. 

Zinc modified cyanoborohydride has been found to be a selective and versatile reducing agent and the reaction of potassium hydride with 9-BBN borinic esters gives rise to a new class of stereoselective reducing agents. ... 

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