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Research methodology:

Synthetic approach:

Preparation of Compounds :

(a) Synthesis of p-hydroxy cinnamic acid and

(b) Synthesis of n-alkyl halides are prepared by established method [40].

(c) Synthesis of p-n-alkoxy cinnamic acids and

(d) Synthesis of p-n-alkoxy cinnamoyl chlorides are prepared by modified method

Dave et al. [39]

Scheme of Synthesis :

Acid Chloride

(A)

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(e) Synthesis of p-n-alkoxy benzoic acids

(f) Synthesis of p-n-alkoxy benzoyl chlorides are prepared by modified method Dave at al.[39].

Scheme of Synthesis :

(g) Preparation of Ethylene Derivatives was prepared by established method

Patel and Doshi [25].

Scheme of Synthesis :

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Synthesis Scheme for Series- 1,2,3 & 7

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Synthesis Scheme for Series-4,5,6 & 8

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Work Plan :

Phase wise plan of work achieved.

First Phase :

◘ Synthesis of p-hydroxy cinnamic acid, p-n-alkoxy cinnamic acid and p-n-alkoxy cinnamoyl

Chloride.

◘ Synthesis of Ethylene derivatives.

◘ Totally 33 new compounds are synthesized (Series-1,2 & 3)

◘ Liquid crystal properties are observed through an optical hot stage polarizing microscopy of

homologues of homologous series 1,2 & 3.

◘ To draw phase diagram for homologous series-1,2 & 3.

.◘ To determine Texture of smectic and nematic by Miscibility Method.

Second Phase:

◘ Synthesis of p-n-alkoxy benzoyl chloride.

◘ Synthesis of Ethylene derivatives.

◘ Totally 33 new compounds are synthesized (Series-4,5 &6)

◘ Transition temperatures of the homologues of homologous series-4,5,6 as determine by hot

Stage polarizing microscope and observed liquid crystal properties.

◘ To draw phase diagram for homologous series 4,5 & 6.

◘ Texture of smectic and nematic decide by Miscibility Method.

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Third Phase :

◘ Totally 22 new compounds are synthesized (Series-7 & 8)

◘ Transition temperatures of the homologues of homologous series-7,8 as determine by hot

Stage polarizing microscope and observed liquid crystal properties.

◘ Texture of smectic and nematic decided by Miscibility Method.

◘ To draw Phase diagram of homologous series-7 & 8.

Fourth Phase:

◘ Carried out NMR and IR spectra testing.

◘ Elemental analysis C,H,N of Series 1 to 8 for selected homologues.

◘ Mesomorphic range calculated.