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建哥
Lv 4
建哥 asked in 科學化學 · 1 decade ago

何謂hydrosilylation

請問hydrosilylation中文翻譯

及其作用機制如反應溫度,催化劑,反應種類等

越詳細越好

謝謝

2 Answers

Rating
  • Leonis
    Lv 5
    1 decade ago
    Favorite Answer

    氫矽化反應(hydrosilylation):

    (from http://en.wikipedia.org/wiki/Hydrosilylation )

    Hydrosilylation, also called catalytic hydrosilation, describes the addition of Si-H bonds across unsaturated bonds. Ordinarily the reaction is conducted catalytically and usually the substrates are unsaturated organic compounds. Alkenes and alkynes give alkyl and vinyl silanes; aldehydes and ketones give silyl ethers.

    The catalytic transformation represents an important method for preparing organosilicon compounds. An idealized transformation is illustrated by the addition of triethylsilane to diphenylacetylene:[1]

    Et3SiH + PhC≡CPh → Et3Si(Ph)C=CH(Ph)

    The reaction is similar to hydrogenation, and similar catalysts are sometimes employed for the two catalytic processes. In industry "Speier's catalyst," H2PtCl6 is important.[2] The mechanism is usually assumes the intermediacy of a metal complex that contains a hydride, a silyl ligand (R3Si), and the alkene or alkyne substrate.

    Idealized mechanism for metal-catalysed hydrosilylation of an alkene.

    Asymmetric hydrosilylation

    Using chiral phosphines as spectator ligands, catalysts have been developed for catalytic asymmetric hydrosilation. A well studied reaction is the addition of trichlorosilane to styrene to give 1-phenyl-1-(trichlorosilyl)ethane:

    Cl3SiH + PhCHCH2 → (Ph)(CH3)CHSiCl3

    Nearly perfect enantioselectivities (ee's) can be achieved using palladium catalysts supported by binaphthyl-substituted monophosphine ligands.[3]

    2009-12-21 01:30:22 補充:

    還有另一段文字,不過因為回答字數有限,請再自行連結網站,看"Surface hydrosilylation"這段文章

  • 1 decade ago

    1.RO逆滲透

    (1)逆滲透建議配有紫外線燈管殺菌功能,因經RO淨水處理後易滋生細菌,不建議只單純的使用過濾器+紫外線燈管殺菌。

    (2)最近很火紅能釋放遠紅外線及抑菌功效的竹炭濾心亦可考慮搭配 RO使用(竹炭濾心裝置於RO之後)。

    (3)麥飯石濾心亦可考慮搭配裝置於RO之後使用(麥飯石為本草綱目記載的良藥)。

    2.電解水 =\= 鹼性鈣離子水

    (1)有效消除自由基(過多會引發病變和老化)為飲用還原電位值(ORP)而非酸鹼值(PH),即電解水還原水,基本上鹼性及鈣離子是必要之惡(鹼性及鈣離子是不想要但必須要有的,因為電解水顧名思義需要電解質),請選擇還原電位值-250MV以下而PH值趨近於7的機種,如PH值越低即能生成超低還原電位越佳。

    (2)如果您跟商家提起還原電位值廠商仍一味強調鹼性水、鈣離子水代表產品有問題或廠商專業知識不足,就不要考慮購買。

    (3)電解水還原電位值(ORP)會隨時間而逐漸消除,而變成單純的鹼性水(加重腎臟負擔),最佳飲用時機為生成1日內,所以電解水是不適合儲存為包(桶)裝水飲用的。

    3.能量水(您所謂的活化淨水器)

    (1)市售有所謂的能量水,均宣稱有多國專利,但專利並不代表認證,我受過專利的訓練,根本上說來專利是只要該產品專利別人沒有,而且能生財即隨辦可得的,因專利局是不會檢測有無功效,只會查詢是否有相關專利而核定是否頒發專利;真正能量水應是有公信單位檢測頒發認證書方是。

    (2)如果真是公信單位予以認證的能量水生成器,建議搭配 RO淨水設備使用而非僅一般濾水器做前置處理,因能量水最大功效為小分子水、等滲透壓、促進新陳代謝、促進血液循環等,思考一下如果不是用乾淨水生成能量,一般濾水器無法去除的重金屬及無機礦物質(對人體有害的礦物質)不就也輕易給人體吸收了嗎。

    以上是給網友了解的專業知識,因為您是要經營水設備的事業,因為各家產品不可能盡善盡美,如果產品有不合乎要點(如能量水前置過濾卻不是RO),您就想辦法避重就輕,但不要惡意欺騙 (如(1)無法去除對人體有害的礦物質卻聲明保留對人體有益的礦物質(2)電解水無關酸鹼值卻說鹼性水可以平衡酸鹼值)

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